HUNTA-711 "No! I can't betray myself... No, it's going in! No way! We only agreed to rub against each other, right?!" Absolutely not with someone like that (senpai's girlfriend, kouhai's...)

People you absolutely must not touch (senior's girlfriend, junior's fiancée, mother-in-law, girlfriend's sister, wife's younger sister) and forbidden frottage! The very people you shouldn't make a mistake with are the ones you want to reach out to! Beautiful and well-built, always kind to me—you want to have sex with her, so you muster up the courage to grab her breasts and kiss her. She doesn't completely dislike it, but she won't allow penetration, so you endure with frottage... But when her wet crotch slips in, you end up having unprotected intercourse multiple times!