In the Mouths of Monsters
Read the storyMonster girls need the sperm from humans to survive. Joshua is a human who offers his sperm to various monster girls to help keep them fed. When he tries a new potion to increase his sperm production, but a side effect is his cum becomes addictive to monster girls. He is kind and wants to help the addicted monster girls, but quickly becomes overwhelmed by the demands for his sperm. His regular customers include a sperm vampire, a slime girl, a pair of Goblin twins, and a manticore