Big Barn Zone Act 01 (Patreon)

Trying to reverse-engineer GRO was an incredible success, and they were even able to begin exposing it to Chaos Drive radiation in order to augment its effects.
Rapid growth over a short term was always a hurdle that GRO failed to overcome... But only over the course of a few hours,

Tails was able to develop an active serum that bloated his fat dick up into what some lewd people call a heavy breeder cock.

Rouge is more than happy to oblige, working for GUN's entertainment division now, and supports his work in developing new and safe recreational drugs.