Sorry for the LATE reply!! Even though it interrupted the flow of Sephiroth's fantasy, something about this line just seemed so right. Both because Genesis is all about eloquent phrases (even if others occasionally want to bash him over the head with the nearest copy of Loveless) and because it suggests that there is so much more to it than just a sexual fantasy for Sephiroth.
I'm glad you pointed that out - that's exactly what I was aiming for.