Marco wishes he could make this easier on his friend. (He also wishes he didn't accidentally kick his hormones into gear, and he'll be very horrified about it later, even if they were still mostly in their right minds when they agreed to have sex).

He doesn't mind letting Jean take control of the situation at all. He's a beta and moreover, he's never really given much thought to being on 'top' or on 'bottom'. He just likes being with Jean, so far, he's found.

Jean licks more confidently over him, and he whines softly, starting to pant again as well. Sorry for mouthbreathing all over, Jean. He's arrested by a strange, striking thought. He wants Jean to bite him there.

"Jean," he manages to get out of his mouth with the too thick tongue. "Jean, bite me -"

It's not only bites that can cause bonding, but they start the release of said bonding pheromones.