[He doesn't seem to notice (or care) the way Adam reacts to the word but he doesn't bother pulling back. It's easier to read Adam this way and if they're going through with this, well, they'll have to be used to being this close. However, he blinks in surprise when Adam ups the ante and he chuckles to himself.]

That might be the harder part. [He's. Probably joking.] You realize you're asking me to pretend to be monogamous with you. Isn't that a relationship? That might be a little bit of a harder sell.