Hot damn, it worked!
"Why? You may as well ask a painter why he paints, or a sculptor why he sculpts." He took another swallow of brandy, "because I can, and because it's fun. And because Lust can be an incredibly useful manner in which to condemn others. Also, as I'm sure you could appreciate, it's lead to more than a few deaths -- the Trojan War, which ran on for nine years, was started by Lust for one woman."
'Bride and Groom'? What?! Okay, okay, keep it cool, it's likely a metaphor for... something. Probably having us fill some archetypal role for the ceremony, a Bride and Groom to become Mother and Father to the thing which is summoned.
Belphegor slammed down the rest of the brandy, then rose. "But of course. My Lady?," he said, offering a hand to Sister Sixtus.