I've been looking for links to a Clockwork Orgy clip forever now.
Isis Nile is getting fucked on her back on a couch, and very calmly tells the guy something like "i want you to stick it in my mouth, and let me suck every drop of cum out, ok? go ahead, i want you to cum in my mouth."
Entirely too hot not to be posted here, but you may have to just get the movie.