Fushigi no Kuni no Succubus - Episode 1

Reito, an innocent human boy, stumbles upon a smiling rabbit leading him to a castle. There, he meets Succubus, a low-rank sex demon tasked with guarding the castle. Her job is to suck energy from humans, but Louise, the princess, stops her from feeding on Reito. To help Succubus avoid punishment for attacking a human, Louise instructs Reito to stimulate her sensitive spots, leading to her climax. With Succubus fired from her gatekeeper post, she becomes free to drain Reito's energy whenever she pleases, under Louise's watchful eye. Succubus first calms Reito with a titfuck, making him cum. Not satisfied, she demands vaginal sex, despite Louise's concerns about it being Reito's first time. Succubus takes him as her first man, and after one round of vaginal sex, she is hungry for more. Louise reluctantly allows Succubus's second bout of overstimulation, which results in a massive ejaculation from Reito. Exhausted and wondering, Reito contemplates his uncertain future.