Disclaimer: THESE. BE. NOT. MINE.
Montparnasse kissed Courfeyrac once when he was lecturing him about how to treat Jehan, and they both felt guilty about it afterwards, though the dashing vagabond decidedly less so. He did it to shut up the other man, and also because the hyperactive twat was wearing tight pants, so as long as Courfeyrac doesn't open his stupid mouth to Jehan about it, he doesn't think it's a big deal.
However, the next time he's in the shower, Montparnasse idly wonders if Jehan would be opposed to a threesome. The things he could tell from that kiss…
His shower lasts for a while.