Three years ago on my birthday, I had sex with my step brother and ever since then we have continued to have casual sex. It all kind of started when we met each other at 12 years old. This was shortly after our parents met each other.

Immediate we had a thing for each other. I thought he was cute and he thought I was too. As we developed in our own ways, we became more attracted to each other. Soon after we both turned 14, we started flirting with each other when no one was around and gradually the flirting turned to occasional groping. Eventually we even started wearing just underwear around each other. I think we both knew exactly where this was all headed.

After a few weeks of us very comfortably flirting, groping, and walking around the house half naked together, I finally actually got a glimpse of his cock while he was in the bathroom. The door was partly open and I was walking past when I glanced in and saw his impressive dick.

I continued to think about his cock after that and later that day, when our parents were gone for the evening, I approached him directly. I straight up asked him to show me his dick. At first he kind of shied away from it, but I insisted. I told him that with how much we grope each other and such, we might as well show each other what we have.
He promised to show me his cock if I stripped naked for him and I agreed.

In moments we were both standing naked before each other. Moments later we were pressed up close to each other, feeling each others bodies. His cock was bigger than any I had ever seen and I had seen a few. I had given several guys blowjobs before this time.

For the entire time we were home alone that evening, we laid naked with each other. Each of us were too afraid of our parents coming home to leave his bedroom or even think about getting more intimate. Well as hormones would have, over the next couple weeks we laid together more frequently until one night, with our parents asleep down the hall, I crept to his room and we cuddled up together naked. We knew that we shouldn't even have taken things this far let alone any further.

We talked about taking things further that night but nothing happened until another few weeks passed. I convinced him to let me give him a blowjob. I was honestly desperate for his big cock and he was so anxious for anything with me. Several months passed with us just giving each other oral sex. Then my 15th birthday came along.

He asked me on the morning of my birthday what I wanted for a gift. I told him I wanted him to take my virginity. It took us a couple hours after our parents left for work to get the nerves up to do it. But we had sex, each taking the other's virginity.

We know we should stop, and that we never should have started, but now it has been going on for so long that we don't care anymore. We have each had other boyfriends and girlfriends over the last few years but continue to fuck each other even during those relationships.