Yo trappy boy GTFO from this manga!!!! This isn't some blackmail/rape incest hentai for you to try to brainwash your sister!!! Either you behave yourself as the LITTLE BROTHER you're supposed to be or i make you the bitch you want to be!!! ???
I don't suppose we can get a time skip to the actual couple just having a nice married slice of life type of thing or something, can we? Possibly out of the country so the cockblock squad is out of sight and out of mind haha.