9 times out of 10 I think of him as a Rui only whore. I do enjoy mobxkasa or other tsukasa ships but only if Rui is somehow involved (whether he's being made to watch or tacitly allowing it to happen or better yet the orchestrator of it all). But I greatly enjoy it when after all of that Tsukasa comes crawling back to Rui, whether for comfort or more sex. After tasting Rui's cock Tsukasa will find nothing else could ever compare to the way it fills him, even taking multiple people at once isn't enough. (Largely due to his feelings for him, whether he knows it or not). I also like the idea of Rui finding out Tsukasa's been fucking other guys and going batshit yandere on him ww

Generally though I only like Ritk together endgame, everything else is pretty platonic or in my eyes would be used as a plot device. I'm just basic like that. No shade to anyone who ships other Tsukasa ships though, I don't mind seeing it and some of the art is really cute. I think it's really funny when I see everyone go feral over his pussy too, all the power to you guys. Get that man pregnant, he deserves it.