https://www.amazon.com/dp/B07RCYKHHV
Nyah and her boyfriend Eric are petty thieves looking for a big score. When their friend and co-conspirator, Roland, comes up with a plan to hit what appears to be an easy mark - things change for them forever. Nyah's new ability allows her to explore pleasure and gratification with her lover in new and exciting ways but could come at a very high price.
This is an erotic tale featuring a shrinking woman, breast expansion, magic, gentle insertion, MF and FF intercourse and implied (but no actual) vore.