i was 14, she was 13.
i've always felt my cousin was very attractive. she's a dancer so she has an amazing body with beautiful legs etc. we had a history of being very close with each other, we would play this game where she would try to do something "bad" and i would smack her butt for it, and this would often end with us both laying in the bed next to each other and me just holding onto her butt.

one week i was visiting my cousin in my aunt's house and i was spending the night there and we both agreed to stay one night in the living room and watch a movie. the movie was over and we both laid down on the floor and she fell asleep.

i couldn't stop myself, she was wearing a pair of skin-tight shorts and a small tank top. i felt around her thighs, at the time i had a foot fettish so i grabbed her foot and pressed it against my crotch. i kissed her legs, i even lifted up the waist band of her shorts and her panties and got a peek at her unshaven vagina. i then peeled up part of her tank top and began kissing her stomach and put one hand on her breast over her shirt.

as i was kissing her stomach i felt her hand on mine which was on her breast. i looked up, afraid of how she might react, but she had an odd grin on her face. "keep going" she said, so i did, i licked around her stomach as she took off her top and revealed her very petite breasts. i kissed up to them and began moving my tongue around her soft pink nipples.