Gwen not only knows magic but she also knows all the right buttons to push to get Elliot to go along with whatever she's wants.
Something that I don't think I've really drawn or see a lot is clothing transformation, turning others into stockings and underwear and such and they can still feel and sense everything around them. I guess it's kind of weird but heck so is vore and most micro macro stuff so I can draw what I want...yeah...I might do stuff like this from time to time.