:The Succubus Fantasies:

"Only if you make me feel good, first" you tell her. And why not? This isn't real. This is a fantasy created by the succubus. The normal rules don't apply here. This sister of yours is rounded and cute. She could be fun.

"What do you mean?" she asks.

"I think you know what I mean. If you want my help, you need to do something for me."