@LittleBuster1 there was no way this was gonna end with a harem ending. you're looking at the wrong type of manga if you're here for harem endings. go read isekai or some shit.
They can use their similar appearance to NTR yotsuba without fuu even knowing.
>Be me
>Wake up
>See my wife next to me
>Jizzed in her last night, hoping she's pregnant
>Leave the room
>See my wife's twin sister
>"Hello honey"
>H-honey?
>Oh