Im no expert or the creator, but from my experience Super Dom will simply either add, or change how certain interactions play out. Ive seen this most with Jennika, who is dom herself, but the MC as a super dom can take the upper hand on her, which changes scenes and interactions from her being in control, to the MC being in control.
Jennika is not the only girl it works on, but with her I believe it's most painfully obvious.