Well damn. Sex between accomplished magicians is very interesting.

Magical Sex Combat.
Must be seen to be believed. And even then not entirely understood.
I approve of this confusion.

She’d had enough time to think now and smiled. “Did you know I can cast a spell, after only seeing it just once.”

oh, that made me think of a shocking scene in that story, "The Twilight Enigma": Twilight copies Tirek and eats Discord's magic...