Female muscle growth, Cláudia Costa, Pedro's ex-girlfriend who has a very slender body wants to enhance her body without working out, because she knew about Pedro's fetish about female muscle, she starts working on a formula that would make her bigger. She uses Pedro's coworker Natacha Santos as a guinnea pig without her knowledge and after seeing the results she goes to try her formula in front of Pedro.

Chapter 2: Building Tension

As Cláudia strode through the labyrinthine corridors of Dr. Rodrigo Monteiro's laboratory, her heels clicked against the cold, hard floor like the rhythmic pulse of a predator. The sterile brightness of the space cast dark shadows across her angular features, lending an air of mystery to her slender figure. Her mind raced with the prospects of what awaited her; the tantalizing thought of enhanced curves filled her with a thrill that was as intoxicating as the heady mix of chemicals that filled the air.

Cláudia, with her slender, toned body, had always been attracted to Pedro's fascination with female muscle, but she wanted more. She wanted to be the perfect specimen, the ultimate object of desire. So she sought out the help of an eccentric scientist, Dr. Rodrigo Monteiro, who had a background in genetics.

Late at night, they worked in secret, their fingers dancing over test tubes and beakers as they mixed and stirred concoctions that seemed to defy logic.