There is a conflict of sort with the Ascension mod. If you don't put a geas on Sarevok, and he doesn't change alignment (which this mod never lets you do), he joins Melissan in the final encounter. That is completely out of character with the romance mod.
Ascension is such a popular mod, the romance mod should have accounted for that. Easiest would have been to allow alignment change at the completion of the romance, since that blocks Ascension's switching sides function.