"Mmm" Mark couldn't help but moan as Ethan continued to fell about their shared penis. Ethan was enjoying it too, but he stopped to look at Mark.
"What should we do about this?"
Mark blushed, he knew what he wanted to do with this new predicament, but said what he thought Ethan would want to hear, "I don't know. What do you want to do about it?"
Ethan smiled and rubbed Mark's back, "You don't have to lie, I don't mind, really! I know what you want to do, I can feel it through this chest of ours! Not to mention that you cause our knew conjoinment to throb every other second..." Ethan put his hands behind his head, and made their cock twitch himself.
Mark grinned as he started feeling about their new connection. It felt just like his own for the most part. They shared a single shaft with one sack joined to its base, but they still had their four separate testicles. One side of the base was attached to Mark, while the other was attached to Ethan.
Mark began rubbing their cock, but Ethan soon butted in. "Ugh, what is it with you guys? First Luke, and now you... I wonder if Max is the same way."
"Luke?" Mark looked puzzled, "and Max? what about them?"
"When me and Luke were stuck together, he started jacking off just like you are. Was just wondering if you all three of you practice together, and why you share the same technique."
"Wow, what?!" Mark's mouth hung open. "You mean, Luke... tried doing that... when you guys were two-headed?!"
"Ya he tried, but I couldn't stand it so I had to show..." Ethan caught the disturbed look in Mark's eye, "It's not important right now... Here, let me show you now..."
Ethan brushed Mark's hand away as they rolled onto their side. He started slowly, while thrusting his hips to get them extra had. Mark nuzzled his head next to Ethan's and closed his eyes while running his hand along their combined chest. Ethan started pumping harder and faster, while the two of them were heavily breathing. They looked at each other as they felt their shared cock poke them in the bottom of their joined chest.
"It's... too big..." Mark could barely speak.
"We'll just... point... off... to the... side..." Ethan panted and rolled on top of Mark, as sweat rolled down his face and onto Mark's. Ethan continued to work their cock while slightly tugging on their joined bodies as Mark ran his hand through Ethan's hair. They locked eyes as they felt themselves getting ready to blow. They were both thrusting in sync to Ethan's fist as they finally shot a stream out across the floor.
Ethan collapsed on top of Mark, who embraced him in his arms. They lay still for a minute, with their faces pasted together all covered in sweat as they caught their breath. Ethan pealed his face away, and gazed down at Mark, "I hope you don't think this is wrong or whatever... But that was amazing. And I'm not going to say this just from that, because this whole time we've been stuck together has be indescribable , but frankly, I would like to have you joined to my chest forever."
Mark squeezed Ethan, "I feel the same way!"