It's that instant when they're saying to themselves, "Damn, my girlfriend doesn't do it this:" Yeah, we apophthegm the light bulb go off in Collin's head too, but that bulb got even brighter when Tony started giving Collin's ass some much needed attention. Tony munched away and Collin's groans of comfort started to ascent. Tony knows his straight guys, and when they respond to anal play, he knows to boost the envelope. Tony put one finger in Collin's ass, and Collin got rock hard.