Amy dug through the box and felt a scaley texture. She pulled it out to reveal a giant reptile tail. Nathan looked at it and raised an eyebrow. "That thing is huge! How'd that fit in there?" Amy smerked. "Like I said, the box is magic. There is no Bottom." Nathan snatched the tail out of her hands. "Whatever. Don't fall in then." Nathan said sarcasticly examining the tail. "So how does this work anyway?" Nathan asked. "Donno. Just put it against your butt or somthing."
Nathan felt ridiculous for following along in this. He placed the big tail to his rear and waited. "So is this thing supposed to be attached or- Woah!" Nathan jumped off his bed to see the detached tail moving on its own. The tail slipped into his pants. The tail dug down deeper, leaving it slanting out of his pants. Amy was wide open as she watched the tail dig into her boyfriends pants. She didn't think it would actually work like that.
The tail started wheighing down Nathan's pants as they started falling down. "What... what's going on back there?" Nathan asked Amy as he started pulling his pants down. Amy saw that the tail was starting to merge with his skin. The scales transitioned smoothly to his flesh. Nathan felt a jolt in his spine as he felt it extending. His spine was growing longer and thicker, fitting in to the tails structure. Once his spine reached the tip, the tail started swishing at Nathan's command. Nathan fell to his knees with one hand on his new tail.
Amy looked at Nathan, with a mix of disbelief, but smugness. Basicly a "Not what I expected, but I told you so" look. Amy approached Nathan, grasping his big dino tail at the base. This caused Nathan to moan, feeling the sensitivity in his new tail. "Well, I don't think I need to say anything. Except, nice ass." Amy rubbed Nathan's scales. "You could've picked s omthing more subtle." Nathan said with an annoyed expression.
"I think it's my turn now. What should I go with then?" Amy started digging through the box once again.