Shortly after she cheated a couple of years ago and we broke up for a bit, I told my girlfriend that it turned me on to think about it. At the time, it seemed like her only concern was that she was worried it would make me mad if she went through with it, but didn't really object to the idea for any other reason.

A couple days later, although she had reassured me that she didn't think less of me because of my confession, I felt embarrassed and told her I had just been upset by her cheating and hadn't meant it. She seemingly believed me and we haven't really spoken about it since.

For the past ten years I have been very intrigued by the idea. Until it actually happens I can't say 100% that I'll actually enjoy it, but I think I will. It's all I get off to. Her and I are getting back together, and I want to bring it up again. I don't want to come across as wishy-washy and have her think I'm just being weird again.

How can I bring it up in a way that will believably convince her that I wasn't lying when I originally confessed, and actually want to try it during our renewed relationship? Preferably a way in which I can't take back in a moment of self-doubt?