The summer I was 15, I got sent to spend a week with my 30-year-old cousin, Gwen. Her husband was overseas in the military, and she needed someone to help with some fairly extensive yard work.
During the day, I couldn't help but notice how Gwen dressed. It was hot outside, and she dressed for it - short shorts, crop tops and sandals, but sandals with pretty high heels. I'd get horny just watching her, and later would often jerk off thinking about her.
One night, I got up to go to the bathroom. I heard moaning sounds coming from the living room. My curiosity got the best of me, and I quietly walked in.
I saw Gwen lying on the couch, her legs spread wide, her shorts cast aside on the floor, her crop top pulled up over her small but firm tits. She had three fingers of her right hand jammed in her pussy, and was using her thumb to massage her clit. With her left hand, she was pinching and rubbing her nipples. I was close to the couch, but her head was turned the other way, and she couldn't see me.
She continued to moan, and her breathing got louder and shorter. She worked her cunt harder and harder, and began to pump her hips up and down.
Immediately, I got hard as a rock. I'd been sleeping just in my underwear, and I couldn't help but pull them down and start stroking my cock.
It didn't take long. Gwen thrust her pussy up in the air, working it harder and faster. Soon, she gasped, shuddered and squealed as she came.
I couldn't stop myself from climaxing, and I didn't even try. I grunted as I shot my spunk in a long stream, some of it landing on the back of the couch, some of it falling on Gwen's tits.
That's when she looked around and smiled.
'I thought I heard somebody,' she said, using her fingers to scoop my jism into her mouth. 'Thanks. That really got me off. Man, I gotta do that a lot with Don gone.'
Needless to say, by the time the week was over, I was sorry to have to get on the bus and go back home.