I was 12. She was 15, Greek (with an accent and very tanned as it was the middle of the summer).
We were friends and then one day she kissed me... It rapidly progressed from the occasional kiss to roaming hands over and under clothing...
Then came the "sleep over". We'd both showered before getting ready for bed. We closed the door (to keep the sound of chatting and giggling down of course) and climbed into bed. We lay there chatting and giggling for a bit... Just long enough for the door to be opened and be told it was time to sleep. Once the obligatory "check from the parents" was over the good parts started.
Cuddling and kissing lead to roaming hands... Which lead to roaming lips, and jammies pushed out of the way. I wanted to taste her, lick her, touch her everywhere! She had one of the most perfect pussies I have ever seen (even if this was well before shaving or waxing would have been the thing to do).
I still remember how nervous I was as my tongue slipped out from between my lips to taste her. I was lost at first taste and devoured her like an ice cream on a hot day.
When I moved back up her body to kiss her again our thighs were entwined, and smooth thigh rubbing against pussy was a two way street. There was a lot of deep kissing, roaming hands, and the sexiest humping I had ever dreamed of. I felt her pussy quiver as she came against my thigh.
It was all so new, and purely experimentation but it certainly stayed with me over the years because I am equally enamored with men and women.