Grab his crotch.

You put your hand on his crotch, rubbing his dick through his pants. Greg is too shocked to speak, and barely manages to set his drink down. You rub his dick further, and a small 'ooh' slips out of his mouth. He looks at you confused, but you simply move closer and keep rubbing his cock.

"Doesn't look like you have any problems tonight, dude." You say to Greg. He's still speechless, but you don't wait for him to speak. You push him back on the bed, and unzip his pants. You slide your hands down under his boxers, and find he's already started to go limp.

"I see... anxiety?"

Greg nods, but doesn't say anything. You shrug, and pull down his pants a bit further, and then his boxers. His dick is nearly limp at this point, but you give it a good rub anyway. Looks like Greg could use a good colon probing. You stand up, and start to pull down your jeans. Greg sits forward, and starts to help you pull off your jeans, and then before you can react, he starts to lick your cock and balls. He does a poor job of it, but you don't complain, its his first time.

"You know... I used to spy on Ben, sometimes, you know..." Greg says. You remove your boxers, and begin licking your fingers. "You know... in the shower. I used to wonder what it would be like to be fucked by my own son, even when he was much younger. I used to imagine what it would be like to have his small cock in my ass..." You slip a finger in his ass when he says this, and immediately he contorts, squeezing your finger with his ass. "Something like that, I guess. Wow, thats good."

You start to slide your finger in and out a bit quicker, and Greg's ass shakes. "I wonder what Sonja would have said had she seen little Ben fucking his old man?" He moans a bit, but continues talking as you slide your finger in and out some more. "Do you think a 13 year old boy would fuck his dad? What kind of dad goes and does that anyway....oh god..." Gregs whole body shakes a bit, as you continue to pick up the pace a bit.

"You like?" You ask.

"God yes. I'd even let Sonja do that. Keep going... dammit, keep going. Its so good!" Greg moans as you keep fingering him.

"Did you ever think about me?" You ask.

"Not a once, kiddo. When you guys were friends, I still thought about him mounting me... and a few times that you guys were having sex when watching pornos, but never bout you. Ahhh.... shit. Keep going.... shit.