Nathan pulls out a horses tail from the box. That wasn't as bad as what he had mentioned before. "You really want to think of me as a barnyard animal don't ya." Amy said with a smug smile. "Just put it on already!" Nathan said, handing her the tail. Amy grabbed the tail and held it to the top of her rear. The tail wasn't cooperating however and Amy started worrying. "Well? I'm waiting for this 'magic mending' to happen." Nathan said sarcastically.
Amy started to loose fate. Nathan started chuckling at the whole situation. Amy sighed. "Was this do you'd get to see part of my ass- Ahh!" Amy felt a slight tug at her spine. Nathan caught note of her jolt and looked down in surprise. Her flesh started to extend from the base of her spine, suddenly connecting to the tail. Nathan and Amy stared in shock as her skin merged with the base of the tail. Amy fell to her knees still holding on to the tail that just attached to her. "Oh... Nathan... This feels weird..." She said rubbing the base of the tail.
Nathan could only stare as his girlfriend just had a tail attached to her butt. "This... This is some sort of prank, right? Who's in on this?" Nathan said freaking out. Amy was now moaning with pleasure, stroking her new tail as it started swishing on her command. "Heh... What'd I tell you. Wanna feel?" Amy asked with her new tail flicking seductively. Nathan hesitated, but dropped to his knees to feel. The base was warm with her skin, causing her to moan to the sensation, which was slowly turning Nathan on to the idea.
Nathan was actually getting horny over Amy's tail. His mind was overwhelmed with what was happening. Was he really thinking how sexy Amy looked as an animal? Or how he'd look? What was going through his mind?