I realize dubious consent is a common theme in BL but this is just flat out rape, GRAPHIC RAPE. I read past it just to see if it got better, and while a few of the jokes made me laugh, it was just an all around unhealthy dynamic. And even if it wasn't for the rape and blackmail stuff, the tsundere thing should have a limit. It got even worse with the second couple which includes Tetsuhiro's brother, the scenes there were TERRIFYING because it was also rape, but this time revenge rape. Koisuru Boukun is also the sequel to Challengers (read it, wasn't impressed), there you can get a little more insight as to why Souichi is as homophobic as he is. Which if you are anything like me it'll make you more livid at Tetsuhiro. I wouldn't recommend this manga.
Koisuru Boukun