A Story as Old as Time
I had 2 views of this.
This is Faust. Seymour sells his soul to the devil (Audrey II) to get what he wants, (Audrey).
The Garden of Eden. Seymour is Adam, Audrey is Eve and Audrey II is the serpent. Seymour is good and does not know evil until Audrey II comes along. In a twist, Seymour does not take a bite of what Audrey II offers, he instead feeds the serpent what it wants.