When I was 13, I would sleepover at my cousin's house, who was three years older than me. I would sleep in the same bed as her because we were like sisters, so it didn't matter.
One night, she touched my feet with hers under the covers. She slipped her leg through mine and started humping my butt. I was very turned on. She got on top of me and lifted up my shirt, revealing my 32 AA tits. She licked my nipples and sucked and smacked them, and I moaned every single time. She slipped her finger into my shorts and fingered me to an orgasm, then patted my pussy and cleaned me up. She turned me around and fingered my butt. Then she slipped her tongue into my mouth and we made out.
I'm not into girls, but I don't mind some girl-girl action every now and then.