public-health-common-welfare
Now that he is no longer crying about his mother, Lan Xichen is suddenly extremely conscious that he is cuddling with a very cute boy-- and not just head-on-shoulder cuddling, their bodies are pretty entangled-- in said boy's room, on his bed, and the boy's hands are in his hair, and the boy is very intently studying Mandarin and he's clever and determined and also still has a maleficer aura which shouldn't be as attractive as it is and now instead of garbage he smells like soap.
Lan Xichen is theoretically attracted to girls but he has put a lot of work-- both magical and nonmagical-- into shutting that down, so that he could be in this situation with a girl and feel nothing but mild awkwardness. He has not at all put this effort into shutting down his attraction to boys, and all of his thoughts keep getting derailed by the observation that Masozi's mouth is right there and Lan Xichen could kiss it.
He repeats to himself that Masozi doesn't like kissing and his entire interest in sex and romance appears to be the prospect of using it to obtain mana storage. Shanghai paid a lot to get Masozi. If Lan Xichen kisses him right now and Masozi kisses back, it won't be because he wants to kiss Lan Xichen; it'll be because Masozi thinks-- because Lan Xichen set up a situation that would cause anyone to think-- that this is the payment he wants in exchange for saving his life.
Lan Xichen says, "you know, you don't have to cuddle with me and touch my hair."