tf is wrong with Kurahashi sensei? why on earth would she think this was worth to publish it? in the name of BL this manga is just disrespectfull.
From the start we have Sudou who bulllies Shouta plenty most of time, as it was some kind of funny thing to do, like when you were a kid and have someone that used to bother you and some random adult say: oh that's because he likes you! he wants your attention! so fucked up to think like that being an adult. But, I can understand if you're a kid or a teen, 'cause you're just learning about how to deal with your feelings. But in this story, they're both grown ups. And Shouta just let Sudou mess with him, 'cause he doesn't know how to talk to people. That's the reason besides his silence and anxiety: he doesn't know how to talk to other people than his family, so he let Sudou bully him.
And that's the minor problem in here: there's rape (I mean Sudou LITERALLY ASKED to Shouta if he can rape him :)))), there's a scene where Sudou masturbates Shouta IN FRONT OF SHOUTA LITTLE SISTER. Of course it's okay, 'cause she didn't see anything, they were doing it inside the Kotatsu, and besides that she's just a child so why would she understand. And the only thing I could think while reading this shit was WHAT THE HELL IS WRONG WITH YOU KURAHASHI, geez.
This isn't worth your time unless you're into this kind of crap.
In that case I recommend you therapy. For real. And be tf away from children. It's not okay to have sex or anything related in front of them "because they don't understand".
This is just a poorly poorly managed manga. It could have been so much better.
Even the explanation of why Sudou acts like a jerk in front of Shouta is shitty.
I'm disappointed.