for what it's worth I personally don't believe spite had anything to do with the pantry near-kiss experience at all. I think that was a 100% lucanis naturel disaster no supernatural additives present or indeed required. at most spite was watching that whole situation go down with mild puzzlement about approximately every part of it, I don't think he'd have much interest in it one way or the other. the explanation seems much more mundane and grounded and in some ways much sadder to me.
if your nervous system has never been in a place where any surge of emotion, even -- in fact sometimes especially! -- a good and exciting one makes you feel like your soul just touched a hot stove it can't get away from, then sincerely, from the bottom of my heart and without a trace of snark, thank goodness and I hope you never experience it. For the rest of you... fistbump of solidarity it's rough out here but *grits teeth* we stay silly etc. In the place lucanis is in during that part of the game, feeling like you're losing control (again even for ostensibly good happy reasons) can feel an awful lot like you're dying, or worse. on top of everything else going on for him -- again going only with non-supernatural elements and not even comprehensive: a year of non-stop horrific trauma added to pile of previous mountain of childhood and attachment trauma. chronic sleep deprivation. apparently dead grandma doubling as mother figure. cousin-brother aggressively fucking around and in real danger of finding out. fucked up the ONE thing he thought he knew how to do that's been the central pillar of his identity. the world might be ending even more than it already was because of it. keeps faceplanting with barely any dignity and having to get up again with alarming regularity GOD how could I ever not save treviso this man desperately needs a W (just one!!) like few people in the history of the world have before him. he's more caffeine than man because the alternative feels worse. it's bad in here. and ON TOP of all that he's in the process of falling just. appallingly soul-shrivingly in love, which can notably be playing on hard mode even when you're in a mostly functional place, that shit routinely rocks people to the core under the best of circumstances.
so I'm not surprised it's too overwhelming for him to handle when he tries to throw himself in head first -- in fact I'd have been more surprised if it weren't lol. he clearly wants it so much, which only makes it so much more painful that he can't actually bear to touch it when it's offered to him freely and eagerly. this is the tantalus-level awfulness of this kind of attachment trauma; food seems to be right there, you can see it, almost smell it sometimes, but no matter what you just can't seem to reach it. seemingly not for any flaw in the existence of the food, but because of something broken in you that can't or can't bear to actually eat. his deliberate flirting routine is kind of deeply dorky tbh lol (in the most endearing way possible let's be perfectly clear) and I don't think it's entirely natural to him -- that's a hastily cobbled together 'oh god I am getting the vibes here it is happening for some reason they like me for my personality quick what would illario do' approach if ever I saw it, supported by the fact that it never really makes a return after this --
BUT I do think his obvious near-unbearable delight with rook's existence and person that shines through in that scene is entirely real and unfeigned. he likes them so much. he wants so bad to be able to be close to them. he's so hungry for the reprieve and release and relief they represent to him, just for one moment, just one break from all the awfulness to have something uncomplicatedly good. and it's here, it's been offered, he's welcome!!! and he has to flinch away at the last minute anyway because he's an exposed nerve of a human being. there's a point at which every sensation including joy becomes indistinguishable from agony. he's pretty much exactly at that point. for the love of god have some mercy on him people. the feeling that salvation is right here but you're too broken a vessel to hold it is one I wouldn't wish on anyone. let him have a few moments to stare into the void before he's ready to get back up and try again surely we all deserve at least that much lol