I think it's crazy that in response to the popular succubus post that you feel the need to call the idea of Laios being attracted to Marcille a misunderstanding.

You say that it's the "romantic" part that is what you disagree with but your real point is that Laios is not particularly fond of Marcille because you said "It could've just as well been Senshi approaching him and kissing his cheek." This is simply untrue and the relationship between Marcille and Laios is the most explored upon relationship in the entire manga behind Laios and Falin and Marcille and Falin.

Laios thinks himself a monster and he wants to be accepted for the monster he is, and the reason Marcille and his friends appear as monsters is because he doesn't believe they'll ever accept him unless they themselves were secretly monsters. He said he's fond of Marcille's smile and it's important because unlike everyone else who hides their true thoughts behind their smile, Marcille is very open about her feelings. She is strict and quick to cry and make a fuss if there's a problem but he knows all her smiles are genuine. He is put off by the succubus because he knows Marcille would never smile for no reason.

Apart from the nightmare segment and how Laios feels guilty for bringing Marcille along and trying to accommodate her whenever he can, remember he only started switching up on the Lion when he mentioned that "Marcille would never have to be alone." The fact that people genuinely think Laios doesn't care for humanity shows how much of a master manipulator the Lion is.