[Momoyuukaku (Tear)] Oshiete Onii-chan (Fate/kaleid liner Prisma Illya)

Shirou Emiya gets far more than he bargained for when his two eager sisters turn their rivalry into a competition for his body, each determined to prove she is the better lover. Kuro eagerly demonstrates her oral talents while Illya refuses to be outdone, and soon both girls are baring themselves completely and demanding he choose which one his cock prefers. What follows is a sweaty, relentless threesome where the overwhelmed older brother can only confess he loves them both as the sisters climax again and again beneath him.