Looking for a manga

I remember it's about this uke who's with a pretty abusive boyfriend? Or one who isn't faithful at least because uke's little brother (not sure if they're blood related) comes into his apartment one day and begs the bf to go after him instead of the uke to "save" him. but in actuality the little brother is a hoe who enjoys stealing all the uke's bfs and things. i also remember that the mother keeps calling the uke and warning him not to let his little brother stray off the path because the mother knows the uke is gay and doesn't want the little brother to associate with him while not knowing that the little bro is a hoe. I also remember the uke getting a call one day while the bf is having sex with the little bro and the little bro is acting all innocent and confused like he doesn't know what sex is.