Hooked up with my Best friends Fiancée on our couples vacation [MF]

Hello, My girlfriend and I rented a lake house with one of my old friends and his fiancée. The house had two bedrooms that shared a master shower/bathroom, I woke up early one morning and took a shower, and forgot to lock both doors…
When I was getting out of the shower my friends fiancée walked in wearing only a towel. I covered up and awkwardly apologised but she just stood there with a menacing look on her face. She dropped her towel…She’s about 5’4″ and slightly in the chubby side, but she has big beautiful boobs, beyond DD but still somehow perky.
I pulled off my towel and was starting to get hard, she walked closer to me and leaned her knees on the edge of the bathtub, she took my now throbbing hard cock and slowly moved it between her enormous cleavage.
We titfucked for a few incredible minutes then she gave me an incredible blowjob, I struggled to remain silent while finishing in her mouth.
Since then we’ve never done anything, and now we’re are both married to the same significant others from the trip. We’ve giggled about it a few times since, and she’s sent me a couple nude pics over the years, but other than that we’ve gone back to loyal spouses..feels good to get this off my chest.