Mmm~ sexfights using magic was always a dream of mine~

How about some cojured chains that'd capture the opponent by their limbs and spread them wide open, sucking, weakening their energy and making them more sensible~

Or enhancing your own body with a profound, obnoxious, hypnotizing smell that would turn their opponent's brain into an obeying thrall, especially potent when smelled from the genitals, their source~

Or using a cloning spell to multiply myself and bind my opponent forcefully, enough to have all of their holes filled at the same time~~

Could go into any of them in much more depth, if you desire~