When you walk into Tails' lab after seeing a bright green flash, you find him standing in front of his workbench looking back and down at himself. He now has a dumptruck of an ass, and he seems to be contemplating why this is, ass clapping and length hard. He's been in the workshop all day, and his body had worked up a sweat, which was dripping down his asscheeks.

"Hmm, I didn't expect this enhancement ray to literally enhance my posterior to this size~ I must make adjustments."