Otouto no Seiyoku Shori wa, Ane ga Suru Mono da to Onee-chan wa Omotte iru.
manga
finished
Score: 6.3 of 10
Description
My father just remarried, and I now have a stepsister around the same age as me. What's more, is that I'm using her as my own personal fap-pet! She's the shortest at school. She's also got the biggest bust! For some reason, she's under the impression that it's her job to care for my sexual needs, and I'm not about to correct her any time soon~!
(Source: DLsite)
Note: A live-action AV adaptation (MIMK-113) was released on March 17th, 2023.
Other details
Genres:
Hentai
Other names:
My Big Step-Sister Thinks That Big Sisters Should Take Care Of Their Little Brother's Sexual Urges, My Big Stepsister Thinks It's Her Job to Care For My Sexual Needs
