Maria and I while babysitting

The following is a true story, and only embellished a little.

I’ve known Maria since I was about 3, and have seen each other maybe 6 or 7 times a year every year. We are now both 17.
For so long I could only think of Maria as just a great friend whom I had done so much with and knew so well. But as I hit teens, like many boys of that age, my mind began playing with the sexual scenarios we might have. She began to grow small but well-formed breasts and she became overall curvier.
It was late spring and my family were visiting hers. We are the each the oldest of our siblings. My siblings and hers were playing a game together in Maria’s bedroom, it involved something like putting a blanket over your head and whispering a secret message to someone else in the group. The details of the game aren’t important apart from that Maria and I were frequently seeing each other close under the blankets. Each time we stood closer and closer to one another and on the fourth time our lips touched and we imagined ourselves in a grown up love story, rather than 13 year-olds. We kissed more and more lengthily on every occasion, growing with confidence and skill. The game drew to a close and our siblings went downstairs. With them gone, we enclosed each other in a passionate embrace our young tongues entwining, and our hands exploring the others’ body. We undressed slowly, my hands gliding over her round tits, her hand stroking me in my boxers.
As young and reasonably naïve teens we never did anything more exciting than that but for a year and a half, we would get away from the others and do this in secret. On one occasion, she began to give me a hand-job, but the sound of parents walking up the stairs ended that swiftly. I still remember her gorgeous eyes smiling up into mine as she fumbled with my balls.
On the next few occasions we matured more emotionally and we became less sexual with each other, just holding hands and kissing. We stopped altogether at 15 and saw each other less and less, and for shorter periods of time. That didn’t stop me from fantasising about her though, her sweet mouth on my cock, or her perfect tits bouncing while she rode me.