Please PM if any of these ideas interest you.
Enslaving her Family - A Dominant Boyfriend dominates his girlfriend, and her mother. [Incest between Mother/Daughter is possible but not required]
-Andrew was smart, intelligent, and good looking. Girls got dreamy eyed around him and he exuded the presence of an Alpha Male. He was always the Captain of every sports team he played on and took the lead on group projects on everything. He was by no means a follower in the slightest. A brief stint in the Army before retiring to the Reserves sees him as a 24 year old working a new job. He also has a new girlfriend (18) who he met online and is quite smitten with him. The Girlfriend is a natural submissive while Andrew is a natural Dominant.