Tails was a growing fox. There was no denying it, he was no longer a little boy, he was a young man, his body filled with hormones and feelings he hadn't even known existed. As of late, those feelings in his body had gotten stronger and stronger, urging him to explore himself, get to know his new grown-up body. They were very strong feelings, and very different from the usual things that crossed his mind every day. Tails was laying on his bed, trying to read a book and push aside those feelings, but it was futile, the more he tried to ignore them, the stronger they became. Tails couldn't focus on reading at all and set aside the book, just laying there, with hand resting on his stomach. He started thinking about things that he hadn't before, and they... aroused him. He became very concious about the existence of his cock, that long-neglected bodypart of his that he hadn't given too many thoughts about before. But now it became the center of his body, telling him it wanted to be explored and touched, it wanted attention...
Tails couldn't help it, his hand slid down and down upon his body until it touched his cock that was growing and getting erect. That first touch sent sensations of pleasure through his young, inexperienced body, and caused his cock to just get erect faster. Tails went forward, he slowly slid his hand up the shaft of his growing cock, until he arrived at the tip. He started exploring with his skilled fingers, feeling all the shapes of his young fox cock, sending wave after wave of pleasure through his body. Tails' mind wandered off, as he started fantasizing about whatever came to his mind. He forgot all about mechanics, robotics and science, washed all his usual thoughts out of his mind and focused solely on his own pleasure, his own fantasies, his own lust. He let his fingers slide across the surface of his cock, trying to find the best way to pleasure himself, and closed his eyes as he sunk deeper into his lustful fantasies. He eventually found the best spots to pleasure on his cock and focused on rubbing them, as moans of pleasure started escaping his mouth.
However, something was happening to him as he kept pleasuring himself and fantasizing. His body started changing. It was growing! Tails didn't notice it because he was too self-absorbed in his own pleasure. His body expanded more the further Tails pleasured himself, and then different changes started appearing. It appeared that Tails' cock was growing faster than the rest of his body, growing bigger under the fox's fingers even though it was already fully erect. Tails, however, simply had his pleasure increased by the growing size of his cock and thus didn't pay attention to those feeble feelings from the outer world trying to interfere with his fantasies. As he pushed himself closer to climax, his growth got faster and faster. Tails intensified the pace of his masturbation and completely lost himself to his pleasure, not even fantasizing anymore, just letting himself be filled with sheer thoughtless pleasure. He felt it, his climax was coming, it was coming...!
When Tails finally cums...