I was maybe 20 at the time, she was much older, late 20s or early 30s. She was loosely part of our circle and we used to travel around with a band we knew to watch them live.
It was on the way back from one gig where it happened. The back row of the band’s van/minibus had 3 seats. I was in the middle with my then girlfriend on the right and this woman, Lizzie, on my left. Lizzie was single at the time I think, to me she looked like a proper grown up, she was quite a big girl, very nice in a one to one but shyer in a group. Strawberry blonde, average looks I guess, not what I would have described as my type.
So we are travelling home, everyone’s had a drink, my gf is sleepy. Lizzie has curled up so that rather that facing forward she is slightly facing me. I kind of absently put my hand on her leg, not with any intent that I can recall (she wasn’t a girl I had a thing for), but her legs were touching mine and it just seemed a place to rest my hand at the time.