Can we become friends with benefits?

I'd talk about it before making a move on her. It's possible she's up for it, and that way you're clear about what's happening and feelings are less likely to get hurt. Also know that a girl tends to develop emotional attachment to the person she's sleeping with, so be careful with that. With my FB, I had to make sure I didn't do anything else with him, like spend the night or go out to eat, otherwise I would start to feel like he was my boyfriend. Steer the conversation toward it and make it clear what you both want.