How can i ask a really good friend to be friends with benifits?

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how can i ask one of my best friends if she wants to be friends with benifits with me? we are super close and i know if we were to be friends with benifit nothing between us would change. i can talk to her about anything. we always talk about relation and stuff and it never gets akward. and we were talking one time and she said that if i got her a friend with benifits for christmas that would be the best gift ever. and i told her that i think that would be the reatest present ever too. and i dont know if she was dropping a hint or something. i want to ask her but i dont know how to ask her. what are some ways that i can ask her to be friends with benifits with me?