Freak chance

I was having dinner at a hotel in the Adelaide hills after work. I'd worked until 6pm and couldn't wait for the one hour drive home, so despite being in tradie clothes, I stopped in. The woman working at the petrol station next door to the hotel and had come in for a drink at the bar after work, as she knew the staff.
She joked about my tradie clothes and I suggested that it was hard to pick up in a pub dressed the way I was. She reassured me that it wouldn't be that hard and I sensed there may have been some interest, so I told her I'd be back at the same day and time the next week dressed in better clothes, and that if she was there, I'd try pick her up.
It was a risk to dress up and drive 50 minutes on a whim. But if she showed up and remembered me, it was a sure thing.
Sure enough, she was there and the banter/flirtation continued.
Not being prepared for the best, ie. booking a room (which would have been far too presumptuous). I had to hope that she could host. She had a flatmate and said that she was older and moody, so her place would only work if we were super quiet.
When we arrived at her place her moody flatmate was still awake and watching television in the lounge, so we agreed that I would climb through the bedroom window. But when she opened her bedroom window, I had a sudden thought as to what would be a little different and exciting. So I asked her to just bend over and hang her butt out the window rather than me climbing in. She obliged, and sat hanging out of the window and I was able to eat her out from behind. I took a few breaks in between to slide a few fingers in and out of her, but then went straight back to licking her pussy until she couldn't take anymore and insisted I finger fuck her.
I have done this with her 3 times now. Always in the same way, and she has never even seen my cock. I text her as I climb her back fence and she opens the window and hangs her butt out. The last time I did it I slowly ran my tongue around her arse as I was fingering her which made her climax within 3 minutes.
We have spoken about her coming over and me hanging my cock out of the window. But I worry that might spoil the relationship we seem to have.

I didn't plan it as a fantasy until I had a chance to reflect on it. That's when I decided that it's the only relationship I want with her. And I am sure that we are both happy with that!