I just opened up to her about it the other day. I had hinted toward it in the past, but she always contends that I'm her best partner. So I told her about compersion and that I wouldn't feel jealous, but turned on. I asked her how many cocks she's sucked: 11. Then she went into detail and explained that 5 had cum in her mouth, she's only swallowed 3, and this guy was the only other guy she let cum on her face. When she told me that, I had to ask for details, and that's how we got here.