"Oh, good," Magnus says. He doesn't see the flush, given the angle of their cuddling, but he does know best friend code just as well as he understands bro code and girl code^*, and it occurs to him that they haven't discussed Claudius at length yet. As Galahad's best friend (it's mutual; they've discussed it⁺), he should probably offer up his opinion. "He's really cool, dude, good choice."

*The three codes: hating a scrub your friends love (girl); casting judgement on someone your friends love (best friend); not sleeping with someone your friends love (bro).
⁺Regrettably, Magnus's typist has been waiting weeks to make this One Direction reference.