Zatanna and Bruce Wayne are lovers, partners in justice, and married. They have few secrets. Fewer still when she admits she wants him to tie her up and play out one of her greatest fantasies. She wants him to pump her clit til it's huge, swollen and incredibly sensitive. They agree: he'll strap her down and make her climax repeatedly. Every time she climaxes, her clit gets pumped further. It's going to be thick and begging. She'll learn to beg him to tease and torment her clit until she squirts and starts the whole process over again. Each time they'll measure how big she's becoming. Each time he'll remind her, she cums and he's stretching out that fat pearl. Her clit -- the centre of their fantasies for a whole weekend. He can't wait. Neither can she.

Chapter 2: The First Pump – Leather, Lust, and Begging

The scent of leather and beeswax hung heavy in the Wayne Manor dungeon, thicker tonight, almost cloying. Zatanna stood perfectly still, the cool stone floor beneath her bare feet a stark contrast to the heat radiating from her skin. Soft black leather cuffs encircled her wrists, buckled but not yet secured to anything, leaving her hands hanging loosely at her sides. Bruce stood before her, fully clothed in dark trousers and a charcoal turtleneck that clung to the powerful lines of his chest and shoulders. His gaze wasn't predatory tonight; it was focused, assessing, like a surgeon preparing his instruments. His fingers, warm and calloused, traced a slow, deliberate path along the sensitive inner skin of her thigh, just above her knee. Her breath hitched, a sharp intake that echoed softly in the velvet-draped silence.

"Easy," Bruce murmured, his voice low and steady, anchoring her. His fingers paused, resting lightly on her skin. "Just talk, Zee. No games yet. Just you and me. And the truth." His thumb brushed higher, a whisper against her skin, stopping well short of the apex of her thighs. "Tell me again. Exactly what you want. How far."

Zatanna swallowed, the leather cuffs suddenly feeling heavier. The flickering candlelight danced across Bruce’s face, highlighting the sharp planes, the intensity in his eyes. She felt utterly exposed, naked not just physically but emotionally laid bare. The memory of the pump, the intense suction, the feeling of being stretched and swollen, flooded back – terrifying and exhilarating. "I want..." she started, her voice husky. She forced herself to meet his gaze. "I want it... bigger. Much bigger. Than last time."

Bruce nodded slowly, his expression unreadable. "Define 'much bigger'. Last session peaked at thirty-two millimeters under sustained vacuum. Measured." His tone was clinical, detached, yet the heat in his eyes betrayed the intensity beneath. "What's the target?"

The precision of his question, the cold measurement, sent a fresh wave of arousal coiling low in her belly. It was the Batman precision applied to her deepest, most carnal desire. "Forty," she breathed, the number feeling impossibly large, obscene. "At least. Maybe... forty-five?" Her cheeks burned. "I want it... prominent. Impossible to ignore. Throbbing. Like... like a second little cock." The crude word tumbled out, shocking her slightly, but Bruce didn't flinch.

"Forty to forty-five millimeters," he repeated, committing it to memory. His fingers resumed their slow ascent up her inner thigh, higher this time, brushing the very edge of her pubic mound. She trembled. "Hypersensitive?"

"Yes," she gasped. "God, yes. I want every touch... every breath... every fucking thought... to feel like lightning. Like fire. I want it so sensitive that just... just walking makes me ache. Makes me wet." She shifted her weight, the dampness between her thighs undeniable. "I want to feel it all the time, Bruce. A constant reminder. A constant... need."

His thumb dipped lower, grazing the very top of her labia, the lightest possible touch. Zatanna jerked, a sharp cry escaping her lips. "Bruce! You said... no teasing!"

"I'm not teasing," he stated calmly, withdrawing his hand completely. He held her gaze. "I'm establishing the baseline sensitivity. Pre-treatment." A ghost of a smile touched his lips. "It's already heightened. Good. That means the tissue is responsive." He stepped back slightly, reaching towards the low table where gleaming instruments lay arranged beside coils of rope and the stark, cold silhouette of the gynecological chair. He picked up a sleek digital caliper, its stainless steel jaws gleaming dully in the candlelight. "We need accurate measurements. Before. During. After."

He moved closer again. "Spread your legs slightly, Zee. Wider." His voice was gentle but firm. Commanding.

Hesitantly, Zatanna obeyed, shifting her feet apart on the cool stone. The vulnerability was acute. Bruce knelt before her, his clothed form a dark contrast to her nakedness. He didn't touch her clit. Instead, he carefully positioned the cool metal jaws of the caliper around the base of her natural, unpumped nub. She flinched at the cold touch, at the clinical intimacy. He adjusted the tool with meticulous care, his eyes narrowed in concentration. The digital display lit up. "Nineteen point seven millimeters," he announced, his voice devoid of inflection. He released the caliper, noting the number silently on a small digital tablet beside him. "Resting state."

He moved the jaws again, positioning them vertically this time, measuring the length. "Eleven point two." More tapping on the tablet. He looked up at her, his gaze meeting hers. "This is the starting point. The 'before'. We'll track every incremental change." He set the caliper down. "The goal is significant hypertrophy. Forty-plus millimeters in diameter. That requires sustained, controlled engorgement. Pressure. Time." He reached out, not touching her sex, but resting his warm palm flat against her lower belly, just above her pubic bone. "It won't be comfortable, Zee. Especially at the peak. It will ache. It will feel stretched to its absolute limit. Possibly painful."

"I know," she whispered, her voice thick with desire and apprehension. "I want that ache. I want that stretch. I want to feel... filled. Owned. By it. By you." She looked down at him kneeling before her, this powerful man reduced to a meticulous scientist of her pleasure-pain. "Make it huge, Bruce. Make it so big and sensitive I can't think of anything else. Make me need it."

Bruce held her gaze for a long moment, the candlelight reflecting in his dark eyes. The tenderness she’d asked for was there, wrapped in layers of fierce possession and clinical intent. He rose smoothly to his feet, towering over her again. He cupped her face in his hands, his thumbs brushing her cheekbones. "I will," he vowed, his voice rough with promise. "I'll make you swollen beyond recognition. I'll make every nerve scream. I'll measure every trembling millimeter of growth." He leaned in, his lips brushing hers, a soft, claiming kiss that held the weight of the intensity to come. "And then," he murmured against her mouth, "when it's huge and hypersensitive and throbbing... then I'll put you in the chair. Then I'll suspend you in ropes. Then I'll make you scream."

He released her face and stepped back, picking up the caliper again. "Legs wider, Zee. We need the circumference measurement." His tone was back to business, but the heat radiating from him was palpable. Zatanna obeyed, spreading her legs further, the cool dungeon air kissing her exposed flesh, her heart pounding against her ribs. The tender affirmation was over. The meticulous, demanding journey towards her obscene, beautiful transformation had begun. The cold metal touched her again, measuring, documenting the starting point of her surrender. The ropes and the cold steel chair waited silently in the shadows.

The ropes and the cold steel chair waited silently in the shadows. Bruce’s fingers tapped rapidly on the tablet’s glass surface, the soft clicks echoing in the hushed dungeon air. He input the baseline measurements – 19.7mm diameter, 11.2mm length – his brow furrowed in concentration. "Excellent vascularization noted already," he murmured, more to himself than her, his thumb swiping to open another analytical window.

Zatanna stood utterly still, the cool stone biting her soles, the soft leather cuffs a reassuring weight on her wrists. She watched him work, the clinical focus both intimidating and deeply arousing. Her clit throbbed faintly from the caliper’s cold touch, a low pulse echoing his tapping. "What… what happens next?" she asked, her voice smaller than she intended, the vulnerability thick.

Bruce looked up, his gaze meeting hers. It softened, a warmth cutting through the analytical intensity. "We build the model," he said, his voice steady. "Predict tissue response. Optimize protocols." He stepped closer, the tablet held loosely at his side. His free hand came up, not to touch her sex, but to gently cup her cheek. "Talk to me, Zee. Beyond the numbers. What does that feel like?" His thumb brushed the corner of her lips. "The sensitivity you crave. Describe the sensation you want."

She leaned into his palm, seeking the anchor of his touch. "I… I want it to feel… raw," she confessed, the word escaping like a breath. "Every little thing. The air moving over it. The brush of my panties… if I ever wear any again." A shaky laugh escaped her. "I want to feel the blood pulsing in it. Constantly. Like a heartbeat right there." She looked down, then forced her eyes back to his. "I want it to control me, Bruce. Decide when I squirt. Decide how hard I come. Decide… everything. For days." Her voice dropped to a whisper. "I want to be its slave."

Bruce’s eyes darkened, the possessive fire flaring bright. "Beautiful," he breathed. "Absolute surrender." His hand left her cheek, drifting down her neck, tracing her collarbone. "I’ve studied every note you scribbled in that little black book hidden behind your stage props." A ghost of a smile touched his lips. "The diagrams. The fantasies. The phrase 'sensitivity to the point of torment' underlined three times." He paused, his fingers hovering just above her sternum. "We can achieve that. Amplify nerve response. Prolonged engorgement is key. But it requires endurance. From both of us."

He gestured towards the tablet screen now showing complex graphs and tissue elasticity models. "Forty-eight hours. Continuous state. Minimal relief. We use graduated vacuum chambers." He tapped the screen, showing a schematic of a clear, bulb-shaped device with adjustable pressure gauges. "Start lower than last time’s peak, build slowly. Maintain maximum safe engorgement." Another tap, showing a different device – a soft silicone ring with embedded micro-pulsators. "Vibrational stimulation at sub-orgasmic levels. Constant, maddening buzz. Keeps the nerves firing, hypersensitized. Prevents adaptation." He looked back at her, his gaze intense. "Combined, they could give you exactly what you asked for. That constant, raw, controlling ache. That feeling of being stretched and buzzing and desperate for release that never fully comes… until I allow it. Does that align?"

Zatanna’s breath hitched. The clinical description, the cold schematics on the tablet, contrasted violently with the heat flooding her core. He hadn’t just listened; he’d engineered her deepest, darkest want. "Yes," she gasped. "God, Bruce, yes. That’s… that’s exactly it. That torment. That constant need." Her legs felt weak. "Can… can it really be constant? For two whole days?"

"It can," Bruce affirmed, his voice thick with promise. He set the tablet down on the low table beside the gleaming calipers. "But it requires total submission, Zee. No touching yourself. No relief unless I provide it. You endure the ache, the buzz, the swelling. You let it build." He stepped into her space again, his body radiating heat. His hands settled firmly on her bare hips, grounding her. "You become this gorgeous, swollen, hypersensitive creature. Driven solely by the need pulsing between your legs. My living, breathing obsession." He leaned down, his lips brushing the shell of her ear, his voice dropping to a low growl. "Can you handle that, my magician? Can you become that desperate, gorgeous thing for me? For forty-eight hours?"

A full-body shiver wracked her. The pure, filthy promise in his words, the clinical certainty of his plan, ignited her. Her nipples tightened painfully; wetness slicked her inner thighs. She pressed herself against him, feeling the hard ridge of his cock through his trousers. "Yes," she breathed, the word barely audible. "Make me desperate, Bruce. Make me ache. Make me your gorgeous, swollen slave. Control everything. I submit. Completely." She tilted her head, offering her lips. "Start now. Please."

Bruce captured her mouth in a demanding kiss, his tongue sliding deep, claiming her. His hands slid down, gripping her ass, pulling her flush against his hardness. When he broke the kiss, his eyes burned. He stepped back just enough to reach for the table, picking up the clear silicone bulb-like vacuum chamber. It glinted, ominous and enticing. "Legs wider, darling," he commanded, his voice rough. "Let's increase that baseline." The soft hiss of the pump priming filled the quiet space as he knelt before her exposed sex, the chamber poised. "Measurements begin… now."

The cold metal jaws of the caliper pressed firmly against the base of her clit. Zatanna gasped, a sharp intake of breath echoing in the velvet-draped silence. "Bruce... it's cold," she whispered, her thighs trembling slightly as he held the instrument steady, measuring her unpumped flesh. The digital display glowed: 19.7mm diameter. He noted it silently on the tablet, his focus clinical, detached. "Baseline established." His thumb brushed the sensitive skin beside the metal, a fleeting warmth against the chill. "Now, Zee," he murmured, his voice low and deliberate, setting the caliper aside. He rose smoothly, his shadow engulfing her. "We discuss protocols. Specifically, the reward structure." His gaze pinned her. "You'll be pumped. Extensively. But only after you cum. Every orgasm I wring from you earns time in the cylinder. More suction. More stretch."

Her eyes widened, dark pools reflecting the flickering candlelight. The promise sent a fresh wave of heat flooding her core. "How many?" she breathed, her voice already husky. "How many times?"

"As many as I decide," Bruce stated, a predatory glint in his eyes. "Five? Ten? Twenty? Until you're a sobbing, dripping mess begging me to stop... or begging for more." He stepped closer, his clothed body radiating heat inches from her naked skin. His finger traced her jawline. "Which brings us to the next phase. Training." His thumb brushed her lower lip. "You need to learn how to ask for it. How to beg. Properly." His voice dropped to a rough whisper. "I love hearing it. I'm proud when you take control of your desires, Zee, even when that desire is to surrender completely. Especially then. So... practice."

Zatanna swallowed hard, the leather cuffs suddenly heavy on her wrists. "Beg?" The word felt thick, unfamiliar in this context. "For... for the pump?"

"For everything," Bruce corrected, his hand sliding down to cup the back of her neck, possessive and grounding. "For the cylinder trapping your clit. For the stretch. For the ache. For the way it makes me groan watching you take it." His other hand drifted lower, fingertips grazing her inner thigh, making her flinch. "Be specific. Be filthy. Tell me exactly what you want done to that greedy little pearl." He leaned in, his breath warm on her ear. "Start simple. Ask me to pump you."

She took a shaky breath, her heart hammering against her ribs. "Bruce... please... pump me." It came out soft, hesitant.

"Louder," he commanded, his fingers pressing slightly into her neck. "Mean it. Want it."

"Please pump me, Bruce!" Her voice rose, edged with desperation. "I need it! I need to feel that cylinder sucking my clit in!"

"Better," he growled, a flicker of approval in his eyes. He kissed her temple, a brief, warm reward. "Now, detail. How do you want it trapped? Describe the sensation you crave."

Zatanna closed her eyes for a second, focusing on the phantom feeling, the memory of intense suction making her clit throb. "I want... I want it trapped tight," she gasped, her words gaining momentum. "Sealed hard against my skin. I want the vacuum to pull it deep into the tube, Bruce. Stretch it long and thick. Make it swell until it fills the whole fucking cylinder. I want to see it pulsing, dark and huge, trapped behind the plastic." She opened her eyes, meeting his burning gaze. "I want you to groan when you see how big you've made it. How obscene it looks."

Bruce groaned now, low and deep in his chest, his hand tightening on her neck. "Fuck yes, Zee. Exactly like that." He kissed her, hard and claiming, his tongue sweeping into her mouth. "Good girl." He broke the kiss, leaving her breathless. "Now... visibility." His gaze dropped pointedly to her exposed sex. "You mentioned wanting it seen. The camera needs a clear view. How?"

Her blush deepened, spreading down her chest. This felt even more exposing. "Hold... hold my lips open," she stammered. "So it's... exposed. Fully."

"How?" Bruce pressed, relentless. His fingers traced the outer folds, a feather-light touch that made her gasp. "Be precise. Tape? Clamps? My hands?"

The image flashed in her mind – stark, humiliating, unbearably erotic. "Clamps," she blurted out. "Little... little clamps. On my outer lips. Pulling them wide apart. Like... like a ring of them. Holding me open." Her voice dropped to a whisper. "So the camera sees everything. Sees how wet I am. Sees my hole. Sees my clit trapped and swollen."

Bruce's breath hitched. He retrieved a small, gleaming chrome ring from the table. Tiny, precise spring clamps were evenly spaced around its circumference. He held it up, the metal glinting coldly. "Like this?" His voice was thick. "A ring of clamps gripping your labia, spreading you wide like a flower? Exposing your cunt and that swollen prize for the camera? For me?"

Zatanna whimpered, her knees trembling violently. Seeing the device made it terrifyingly real. "Yes," she breathed, the word trembling. "Please, Bruce... use the clamps. Use the ring. Hold me open. Show everything." She swayed, the combination of verbal exposure and anticipation weakening her legs. "Please... I need it. I need to be spread open for you."

He caught her elbow, steadying her. "Perfect," he murmured, his voice rough with pride and lust. He kissed her deeply again, slow and thorough, his hand sliding down to squeeze her ass. "You did so well." He guided her gently backwards. "Now, sit." His tone brooked no argument. The cold, padded leather of the gynecological chair pressed against the backs of her thighs as she lowered herself, her legs instinctively falling open over the wide-set stirrups. Bruce swiftly buckled the soft leather cuffs on her wrists to the armrests, then knelt, securing matching cuffs around her ankles, pulling her legs wide apart and locking them firmly into the stirrups. The vulnerable exposure was immediate, intense. Her sex was fully presented, utterly open.

He stood, surveying his work, his gaze hot and possessive. "Beautifully exposed," he stated. He picked up a roll of wide, soft black bondage tape. "Tits next." He tore off a length. "Lift your arms, Zee. Hands on the armrests." She obeyed, trembling. He began wrapping the tape firmly around her torso, just below her breasts, cinching it tight. The pressure was immediate, constricting. He wrapped another length above her breasts, pushing them up and together, creating a pronounced, bound cleavage. The tape dug in slightly, a constant reminder of her confinement. "Bound and spread," Bruce murmured, his fingers tracing the swell of her taped breasts, then drifting down her belly towards her exposed sex. He stopped just short of touching her clit, his fingertip hovering. "Exactly where you need to be. Ready." He picked up the chrome clamp ring, its tiny jaws open like hungry mouths. He held it poised before her spread labia. "Needy?" he asked, his voice a low thrum. "Begging?" He didn't move to apply it yet. The camera’s red light blinked steadily, capturing her bound form, her taped breasts heaving, her sex utterly open and waiting, the cold metal ring gleaming in his hand. Her swollen clit pulsed visibly, anticipating the stretch, the suction, the ache… but not yet. Bruce wanted her desperate first. He wanted her to crave the cylinder's bite.