We had been 'going out' for about three months and finally we were on our own in a house with no one else there.
To add context, I should explain that this was the early 70's in a provincial part of the U.K. The 'swinging' 60's had passed us by. Yes, we'd listened to the whole range of music of that decade - courtesy of the 'pirate' radio stations. For those who are baffled, these were small ships which anchored off the U.K. coast and brought us teenagers music that we never heard in its original form on state controlled radio stations).
Previously, my girlfriend and I had explored each other's bodies with exuberance - heavy petting it was called then. But, that afternoon, something was different. There was an intensity to our kissing, to our touching, to our breathing - even though sunlight was streaming in through the windows, not the night time that we'd been taught was appropriate.
We'd started by sitting side by side on the sofa. Soon, we were supine, hands under each other's clothes. Mine seeking her breasts, hers delving into my trousers. In no time, my lips were sucking on a nipple and one of her hands had gripped my very hard cock.
Slightly stunned at how quickly this had happened, we simultaneously paused and looked at each other. Our respective grins agreed our goal. Even though we knew what we both wanted, getting there was more complictated. Her clothes were in the way, my clothes were in the way but we didn't want to stop - didn't want reduce the ardour of the moment, perhaps concerned the other would have doubts. Who knows? To this day, I don't why but we both stood up and started undressing. Soon, we were naked. My eyes feasted on the body that, until then, I'd only known piecemeal. I took in the flush that spread across her chest and that led me directly to her breasts and hard nipples. For my part, I saw her eyes travelling downwards and, for a moment, I felt shy. Can you believe it?
Over in an instant, we clasped each other, our hands moving all over new territory. We mirrored each other's interests, starting at the shoulders and working down the spine until we cupped each other's buttocks, pulling us close together as we kissed with a desire not known before. Our kisses didn't last long as our breathing was too ragged - we wanted more. Somehow we landed on the sofa. She was underneath and I was trying to position myself.
Neither of us knew about oral. All we had some vague knowledge of was 'penis', 'vagina', put one in the other. I kid you not. My sex 'education' even warned that 'self abuse' may mean that hair would grow on the palm of your hand.