Wife has had an fwb for about 1.5 years. They usually meet monthly with some dry spells here and there. This occasion was special because I was there to watch and go next immediately. They had just ended a several month break the week before - coincidentally they had a go earlier in the week on our anniversary, and this was his birthday sex. So sorta special occasion, but they'd had a recent visit, and everyone had to get up early the next morning so it was very basic fun. This audio starts after she gave him head for a few minutes, and she's already been riding him for a while. They've been at it about 10-15 minutes already at 0:00. No protection. Around 2:00 you hear him cum, which triggers hers. 3:10 - 3:33 she says to me "you want your turn?" Then a short conversation to make sure he doesn't want to go another round because he usually does 2 back to back. He declines this time. He also comments on how much she's shivering (she's still cumming). She is climbing off of him and goes to the edge of the bed. 3:33 - 3:45 He comments on her still cumming again, she shivers again and again (we call these aftershocks). 3:45 - 4:00 He's chuckling because she's still shivering *hard*. I pull off my shorts, and he encourages me after seeing I'm stiff "yeah, there ya go". I ask her if she's doing okay. She said she was and I took my time getting into position. 4:00 - 4:15 She assures me she's good. Now that I'm about ready she's started playing with him, she loves holding/stroking a guy while getting fucked by another, but she got a little overexcited or something so she apologized for squeezing too hard. I'm about to slide in, but she has a couple more aftershocks so I go slow. 4:15 - 4:30 A couple more aftershocks and I try my luck and go all the way in. She immediately cums harder and squeezes me out and apologizes. 4:30 - 5:09 I work my way back in and and go for it. It doesn't escape my notice that she's actually continuing to orgasm from sex with her fwb. 5:09 - 5:22 I don't recall and I can't understand their exchange. At 5:17 they chuckle over whatever it was and that basically does it for me. There's not really anything interesting after this except for me grunting lol. This was hands down the biggest orgasm of her life. She's had a couple big ones with me over the years and she was very clear when they occurred, this one was definitely a level above that, she just doesn't want to make me self conscious and doesn't really talk about that afterwards.