Meeting an amm member

Well i did not really expect much as she seemed like a older stay at home housewife who was dissatisfied with home life and wanted a bit of an adventure. We met down the road from her place and she came over to where i had pulled up....about 55 but looked a little older and wore nothing revealing or even to give an inkling of what we were meeting for. To make her feel safer i showed her my license and she told me the only person she had told about meeting me was her sister. WE drove around for a while and had dinner at a cafe, nothing elaborate, and still no hint that we would be having sex tonight and I did not want to force the issue. Dinner was done and I asked if she wanted to go home...." a drive would be nice" and she directed me to a park just near the main road....far enough that we could not be seen in the dark , yet close enough that we could see the lights of passing cars. We sat in the car and like teenagers started to make out....moving into the back seat....deep passionate tounge kissing and playing with her hardening nipples, I slid my hand along her thigh and lifted her skirt to gain access to her pussy....she was so wet and moaned loudly as i started to rub her clit....i moved her panties to the side and inserted a finger as she slid further down the seat to try to get more of my finger inside her....wow...and then all of a sudden...STOP....as she started to straighten up her dress and clothes....I need to get out. Oh well thats the end of that I thought. She went over to the nearby park bench and we sat and talked, her telling me how much she loved what I was doing....why did you want me to stop, I asked. I dont know, I felt cramped and was getting a sore back....Thats all i needed to hear as we started kissing again.....me playing with her already hard nipples and this time i took her panties off and started to slowly play with her clit....inserting one and then two fingers into her.....Please will you lick me she asked.....no sooner said then done...she was squirming and moaning....pushing her clit against my tongue....I was so hard...and then it happened a gush of liquid came out of her pussy.....everything changed....Im sorry...Im so sorry...Sorry....as tears welled up in her eyes....I didnt mean to do that....she was wiping my shirt...and herself with her skirt and panties. I calmed her down and told her it was all good and i enjoyed it.... she seemed shocked and surprised and said "that is why i did not want to stay in the car, I did not want to make a mess". We met a few more times after that and I even met her sister and had to ask if we could have a threesome.... the sister laughed and said "no, Im not into that". This is all 100% true