If jay did leave him alone he would have died (=・ω・=) yoohan doesn't want it because he's so guilty he thinks he doesn't deserve any sense of pleasure and jay forces his love on him so yoohan could want to live again and let go of his guilt. Their relationship is not just a forceful thing and has a big depth to it. You can keep reading the manhwa or read the novel cause the novel explains their complicated lives pretty nicely and shows that their emotions aren't just some shallow attraction but a NEED for each other. Their relationships aren't as simple as some basic "boyfriends" thingy and they don't even establish a defined relationship later anyway because they don't need something like that. You can see that they love each other in such a deep way in the second and third book and that they would lose everything just to be together. You should judge him later when the story actually explains everything and why he did these things.
In this case, yoohan doesn't care about anything anymore so even if jay said he loved him or cared for him yoohan wouldn't give two shit's about it because he's so numb. Jay forces him to feel something by touching him and gives him pleasure. Yoohan did ask for sex five years ago because he was so full inside but couldn't let himself go so he needed pain to just cry it out and feel alive. It's the same mindset but with pleasure instead. He needs yoohan to return to reality and realize he actually wants to live but yoohan wouldn't accept it if jay asked so he forces it. SPOILER: he refuses jay more when he realizes he actually loves jay and doesn't think he deserves such emotions other than pain and misery. He does accept jay and call for him to make him cry because he can't cry alone and ask jay to make him feel pain. Jay does act rough with him to make him cry and later they have a real normal sex.
Oh btw of course share your opinions we're having a discussion if there wasn't opinions then there wouldn't be discussions haha
Kinda getting tired of this. They start off with some tension in the beginning which is hot but then we immediately cut to the seme forcing himself and the uke not even enjoying himself in the slightest