Reverse NTR, 3-part intercourse. Girlfriend's younger sister, only 138cm tall, has a petite body but a monstrous sex drive, demanding intercourse. Minase Lily, FOCS-105

My parents aren't home today... I've already made plans with my favorite girlfriend, and I wouldn't be a man if I refused. But my excitement is disturbing my girlfriend's younger sister, Lily, who's still home. She's an incredibly horny woman. She's tempting me, who's looking forward to having sex with my girlfriend, to play with my penis without caring if it'll be disliked. It's obviously wrong... I have a girlfriend... but that's another matter. Lily's pussy feels so good.