Mark and Zack had been crawling around, and eventually got tired, so they were resting on their back on the couch. Max was sitting up with his back against the arm rest while Zack lay on the middle cushion. Mark was watching t.v, Zack was too, but without thinking, he also had his hand down at their privates and was playing with himself. Mark could feel ever movement and was getting distracted by the boner forming under their shirt. "Zack... could you please not do that?"
"Do what?" Zack looked up at his brother who was now leaning over him. Mark locked eyes with Zack, then glanced down at their fused crotch before asking again. Zack turned a dark red and pulled his hand out from under their shirt, "So... sorry. I... I didn't mean to. I just play around with it anyways. I... I don't really... know what to do... once it gets hard."
"Wait... You mean you've never..." Mark didn't think Zack could turn any more red, but he did and looked away. "Wow... I thought you'd have done that by now. Not that I think about you doing that!" There was a long uneasy silence between them as the t.v continued to blare. Mark was the first one to speak, having worked up the nerve, he bent down to Zack and put his chest flat against Zack's, essentially folding them at the waist. "Er... Zack. If you want... I mean... ummm... I could... show you... what to do."
Zack turned to Mark with an innocence smile, "Really? You'd do that for me?"
"Well, not FOR you..." Mark clarified, "You'd do it yourself, I'd just help."
"Oh, that's what I meant!" Zack said shaking his head, a little flustered and pausing a moment before speaking again, "So... How do I?"
Mark rolled them onto their sides, keeping their chests pressed together, "Ok, well... First you need to think of..." Mark paused when he heard knocking at the door. "Just a minute... I'm coming! One sec!!" Mark rolled over and went to stand up, falling of the couch and dragging Zack with him.
"Ow, Mark!" Zack cried, rubbing their back, "What was that about? Did you forget we're stuck together?"
"Ya," Mark winced in pain, "We can't answer the door like this!" mark gestured to their two upper bodies, joined at the waist. Zack suggested they see who it was first, so they flopped over and crawled to the door. Mark recognized everyone outside, so he and Zack worked together so they could reach up and open the door.
Not seeing anyone at normal height in the doorway, Dean and Allan walked in, tripping over Mark and Zack's middle section. They were no laying on top of Mark and Zack as they struggled to push the two headed boy off. After standing up, they and Kevin looked down at the two joined brothers in shock, "Holy shit Mark! What happened to you?!"
"Uh, hey guys!" Mark waved and smiled, "This is my little brother Zack, we've been hanging out together all day." Zack glanced up and waved nervously. "What are you guys doing here?"
"Uhhh..." Kevin was still gawking at Mark and Zack, "I... came to see if there was anyone here looking to get joined for a while..."
"We came to get split." Dean stated, but Allan added in, "But we think we might hang out a little longer."
"Ok, come on in." Mark and Zack shuffled out of the way so everyone could enter. "Luke and Max are upstairs, they should be down soon."