"Well I guess we better get used to this. And better learn to stand now before mom and dad come to videotape it all." Max looked down at their shared body. It was stocky but not fat. Kenneth was slender going into the procedure, and the extra bone and muscle taken from Max had made them about average for a teen boy. Their shared chest and abdomen were smooth and the abs Max once held so dear were gone, replaced with a flat stomach. He pushed against the bed raising half their body.
"Shouldn't we want for dad to- Fine, we'll do it your way." A mischievous smirk crossed Kenneth's face, and he propped their left side up. "Okay. I'll swing my leg off the bed and- hey!" Before Kenneth could finish the sentence Max lurched to the right, throwing his leg over the bed. Kenneth twisted to swing his leg after. It took a bit of wiggling but they were sitting up and at the edge of the bed now with legs dangling off.
"Sorry, bro, but we did it!" Max gave his brother a smile. He could feel the muscles of his abdomen and back moving of their own volition. "Man this feels weird. You're feeling this, right? Our core and stuff?"
Kenneth gave a nod. "I guess our nerves intermingle. I wonder how dad did it. We were learning about anatomy in AP bio and-"
"God you're such a nerd." Max snickered. "Wonder if they'll let us share grades. And not to get weird but, uh, I do have your dick now. You don't mind me touching it and stuff right? I mean like just to lay down ground rules and stuff..." His cheeks turned red. How do you even talk about this? Would he jerk off with his brother? He would have to. How would this not be weird?
"Is that all you think about? I was a right-handed before this you know." Kenneth held up his hand and flexed the fingers. "Now I think this is my dominant hand. It feels like it, anyway. And we should learn to walk first. There's going to be a ton to learn about this."
Max raised his own hand in response and examined it further. It was soft and un-calloused. The nails were clipped much neater and there was no dirt underneath. "Stop dodging the question. Its a pretty big thing you know."
"You want to look at it? Fine. Let's do it before mom and dad come back..." as cool and logical as Kenneth sounded there was a drumbeat in their shared chest.
Together the brothers lowered their boxers. Beneath was a normal-looking penis and pair of balls. Nothing special. It was definitely Kenneth's member. Max had been circumcised but evidently they'd declined the procedure for Kenneth. "Can I, uh touch it?" Max trailed off. He was outgoing. He was good with girls. Staring at his brother's dick, now his, was quite another matter!