Dylan decided he wanted something thick and long. He eyed a big tail with a weird fur texture and picked it up. "Watertight huh? Must be an otter tail. Why's it so big though?" Dylan thought for a minute before concluding that the tail was probably made to be proportionate to a humans body. "Guess that makes sense. Now how do I attach this?" Dylan tried looking for some sort of velcro loop, or a clip or something, but nothing indicated how to attach the costume.
Dylan went ahead and sat on his bed with the tail behind him. "Okay, maybe I'll try a smaller tail if this is how it's going to be." Dylan was plotting in his head not noticing the otter tail pull closer to him. "What else could I-" Dylan's thoughts were interrupted after feeling something digging into his pants. "Hey! What the?" Dylan quickly looked over his shoulder do see the tail digging into his pants. He stood up trying to shake it off. "What the hell is this? What is- Ah!" Dylan suddenly felt a lot of weight to his lower back as well as a jolt from inside his spine. He looked back to see the tail fuze into his skin. "No way... How though?" Dylan's thoughts again were interrupted as he felt pressure at his lower back, as if his spinal cord was extending to the tail's full length. Dylan collapsed to his hands and knees at the pressure.
A few seconds passed, and Dylan was panting at the experience he just had. He looked back to see the tail attached fuzed with his skin... And moving. The tail was swishing back and fourth with movements of Dylan's lower body. That set in stone what Dylan thought had happened. The tail... Was now his.