It’s not a hard spell. I found it in a book: some monk with a Latin name trying to describe it without describing it, all nod and wink and innuendo.
Not all demons are ugly or evil. Some are actually pretty hot. And very grateful for being temporarily released from the Pit. Twyx ran up my hotel minibar bill (what, I’m not stupid enough to summon a demon to my own house) and started a bathtub fire (don’t ask) but man, there must be a sex school in Hell and she must have been valedictorian.
Totally worth my soul. Totally.