Pretty sure I saw a Phil face in the ice!
The only conclusion that I can come up with is that the more pressing question is not WHY they're wearing her boxers, but rather, HOW they got their hands on them in the first place! Given PB's extreme casual-ness about the whole thing, it suggests that she's a bit perplexed about it but not much more, so the only logical conclusion is that we have a OT3 Fubbleline situation on our hands!
Nice work; the coloring is EXTREMELY good, and I can't help but feel Finn and Marcy have practiced falling unconscious to avoid uncomfortable questions because they're cool like that.
this is so epic and hilarious i can't even tell you. it feels like it could be a whole comic or something... there's so much action n stuff going on in the background. this is awesome. you rock man!