I think those people are the ones skimming for the sex scenes instead of actually reading the storyline? It has been clear, if read entirely, that Senpai wouldn't be doing things if he didn't want to, he just doesn't want to have that reckoning with himself about his beliefs and actions.
╮( ̄▽ ̄)╭ he's had chances to not be with morinaga a couple times now, and yet...he stays. Meh, I've stopped reading most of the comments for the exact reasons you posted above. Too many people complaining about a story they clearly weren't reading closely enough.
People that don’t like this relationship or story still read it just to hate read and then get angry when others people enjoy what they don’t. Same thing happened with killing stalking, you were crucified for enjoying it bakc when it was new. Now it’s one of the most popular BL ever with a massive fanbase. You’ll always have people trying to tell you what you’re allowed and not allowed to enjoy based on their own morals. Don’t worry about it, don’t read the comments and allow yourself to enjoy what you like :)
With a new chapter comes more people complaining senpai is being forced to stay and forced into sex despite the fact he is able to leave at any given time. I’m tempted to go through this entire manga again and bookmark every single time Senpai has
1) initiated sex and expressed consent, including when he told Morinaga outright If he never wanted it, he’d have killed Morinaga by now and left
2) has said he CONSENTS to the relationship and is still with Morinaga because it’s what he wants as well
3) has stopped Morinaga from leaving, despite everyone judging Morinaga for being an asshole and not leaving?
Because I feel like we get one of these three scenarios every single volume but people still don’t get it