Unity Flying Princess: Inter Breed

Flying Princess: Inter Breed is an action-puzzle female protagonist RPG built around character-flinging beatdowns. Monsters in heat ravish the main characters on contact. Clear stages and the monster girls give birth, with newborn monsters growing into playable characters and specific couplings producing specially-powered offspring.

A Japanese parody pixel-sprite game with 5 main characters, 18 monster girls and 100+ pixel sprite H animations.