Hell yeah!

You step forward, and grope the demoness's boobs. "So, how does this spell work? Do you have to do as I say?"

Leaning into your grip, she replies. "No, not really--but your pleasure brings me pleasure, so I'm up for whatever you're in to!" Kneeling down in front of you, she begins unfastening your pants. "Oh, and I can shapeshift, so I can fit you no matter what!"

Shapeshifting, huh? That could be fun...