18 [MF] Accidental bathroom encounter turns into a full all sexual fwb relations with MILF for months now. Read below

So about 3 months ago I a young male went shopping at a rather distant mall. Given the COVID conditions I was not exactly excited for it but I needed to buy a few things that only this mall and it’s stores had. Anyways. After shopping for say an hour I head to the bathroom , normally I just go to the men’s restroom as expected. However it was closed at the time in this corner of the mall and the only available bathroom for me was the family single type bathroom. Granted the women’s rest room was open and people were using that one. So I head to go in and did not bother to knock as the door had the green “ok” symbol to use it. I enter quickly and lock the door behind me for privacy sake. Well cut to me turning around and hearing some strange noises in the back wall part behind a wall of sorts where the toilet and sink are separated. I go in only to see , I shit you not , a 30 ish aged women ( Latina ) masturbating on the toilet. My face got red and she was a little shocked when I came in but not in the “get ou get out” kinda way. She tells me not to go and give her a sec. she then asks if I am ok with her masturbating in front of me to which I reply no problem at all. Mind you she is hot , relatively young looking for her age. She asks me to join her which I then do and we literally have a mutual masturbation session in the mall bathroom. From that point she asks if she wants this to be more than say this random encounter. We exchanged numbers and went about our way . For the past weeks following then we would invite each other to our places and have raw sex the moment she or I stepped in. The absolute lust is amazing. Til this day we continue to have a weekly sesh and all because of this odd bathroom encounter.