[F4M] After finding out my younger brother didn't have a Valentines Date this year, I decided to be a good older sister and be it for him~! (Incest.) (SEND STARTERS!)
[F4M/Fu] Your big sister is here to "treat" your hyperspermia condition, whether you like it or not. Your only choice in the matter is her personality! No-nonsense and curt? Teasing and seductive? Pissed off and man-hating? Let me know!