Seme is a massive ass**** and definitely needs a redemption arc, hopefully it won't be a shi*** one, and I do agree with your sentiment on a lot of yaoi manhwa, which centers around female audience and makes ra** in MLM relationship something they should fantasize about, yaoi as a genre have a lot of problems (heteronormative relationship, strict gender roles, size difference, unrealistic portrayal of gay relationship, ra** trope, etc. )
but I do think ra** here is a bit exaggerated, the other commented says it better than I can, it's dub con at most honestly, not literal ra*