The Magicians (Eliot, Margo)
Eliot may give off a slacker, devil-may-care vibe, but anyone who knows him as well as Margo knows that he's a devil in the library and one of the smartest magicians around. So when he starts spending more time on research than he does on hygiene, she has to speak up.
"I know what you're doing," she mentions one night, "and I know why. But resurrection spells are always fucked. You might bring something back, but it won't be the Quentin you lost."
"I'm fine." Eliot kisses her hair reassuringly. "You don't need to worry about me."