Gwen messed up a spell, which swap her and Ben genitals and also give her Ben's Omnitrix. Then things get nastier. Futa, Alien, Hyper cock and Pregnancy. Futa Gwen x Cuntboy Ben.
Ben 10 - Rated: M - English - Sci-Fi/Drama - Chapters: 1 - Words: 4,670 - Reviews: 14 - Favs: 117 - Follows: 99 - Published: 6/9/2016