This is why he can't stop calling her 'Katie'. Why she has to have the freedom to fuck up. They're good together. Really good. Not just for sex (but the heat in his eyes, holy fuck hot). They're a team.

She leans down to him, hands pushing up his chest, and whisper-growls, "Babe, that goes triple for anyone who isn't Magnus." And ten times over for anyone else you fuck.