love potion effects

"Dammit, Bob. I'm trying to think. If you want to be really useful, you could try to figure out why that escape potion you were so confident of didn't work for Susan."
"Harry," Bob protested, "that's what I'm trying to tell you."
Susan murmured, against my chest, "Is it getting warm in here? Or is it just me?"
A terrible suspicion struck me. I looked down at Susan and got a sinking feeling. Surely not. No. It couldn't be.
She looked up at me, her dark eyes smoky. "We're going to die, aren't we Harry? Have you ever thought you'd want to die making love?"
She kissed my chest, almost absently.
It felt nice. Really, really nice. I tried not to notice all the bare, lovely back that was naked underneath my hand.
"I've thought that, many times," she said, against my skin.
"Bob," I began, my voice getting furious.
"I tried to tell you," Bob wailed. "I did! She grabbed the wrong potion and just chugged it down." Bob's skull turned toward me a bit, and the lights brightened. "You've got to admit, though. The love potion works great."
Susan was kissing my chest and rubbing her body up against me in a fashion that was unladylike and extremely pleasant and distracting. "Bob, I swear, I am going to lock you in a wall safe for the next two hundred years."
"It's not my fault!" Bob protested.
The demon watched what was happening in the circle with froggy eyes and kicked a section of floor clear enough of debris for it to squat down on its haunches and stare, restless and ready as a cat waiting for a mouse to stick its head out of its hole. Susan stared up at me with sultry eyes and tried to wrench me to the floor, and consequently out of the circle's protective power. Bob continued to wail his innocence.
Who says I don't know how to show a lady a good time?


Storm Front Chapter 13, Page 165-166