(Asked by Raxz)
Tails does many things when Sonic’s not there to watch him.
When Cosmo is around, he rapes Cosmo.
Another thing he does? Tails does have a bit of a habit of being a cross-dresser. Evidence here.
And when he isn’t doing either of those… well… He puts on huge round glasses, lightning bolt makeup on his forehead, and a wand, gets drunk and convinces himself his parents were killed by Lord Voldemort rather than being separated from him when he was a baby. This is explained in the following image.