Any help finding this would be greatly appreciated, as all my searching has turned nothing up. Here's what I remember.
This is a chapter from a longer ero manga. The main character and his girlfriend (or sexfriend?) are having sex in their room. Next door, the MC's little sister(?) and another friend overhear, the friend gets horny, and accidentally sticks it in the little sister's butt. Ultimately she likes it and I think they get together?
This is a chapter from a longer ero manga. The main character and his girlfriend (or sexfriend?) are having sex in their room. Next door, the MC's little sister(?) and another friend overhear, the friend gets horny, and accidentally sticks it in the little sister's butt. Ultimately she likes it and I think they get together?
