Every threesome we've had has started like this. My wife has me stand and strip while she & he make out. She makes sure he's fully aroused before asking him to join me so she can record our size difference. We have sex just before he arrives to ensure I stay limp, soft, & laughable while agreeing when prompted by her complimenting him. Usually she has me trying to sword fight the guy. Some are into it, but some get pissed when mine touches theirs & I have to apologize & offer my wife to calm them down