Porthos smirks because he can think of at least a few times when he's been the reason that Aramis is out of sorts in the morning, even though that wicked smile fades when he starts getting far more intent on what Aramis is doing right now.

He parts his lips into an 'o' as he lets Aramis coat them, doing his best not to instantly lick it off and to give Aramis a chance with it, though it's not easy. "My eyes'll be watching you take it off," he guarantees. "Don't worry."