I like to think that Lohen always makes sure to keep a bag of sweets and candies for Klee whenever he sets out on adventures or is strolling around Mondstadt. And whenever he bumps into her Klee brightens up and drags him along with her to go fish bombing (bc this guy's the only one who supports her very questionable activities lmao) and they spend the whole day terrorizing Hilichurls (and fishes). And Lohen most probably tones down his uh very brutal way of fighting just for her (cuz she's still a kid even though she has teyvats' most deadly bombs on her). If Klee happens to be in solitary confinement by any chance Lohen would def try to visit her whenever he can and bring stuff for her ;>. He'd also try to get her out of trouble too (but end up in solitary confinement with Klee though lol).
But that's just a theory. A Game Theory :)
