I regularly have sex with my step brother. We met when we were both 15 years old. Our parents were dating at the time and we never expected them to become serious so we had sex a lot for the first year. At about a year mark, we all moved into one house. By then we realized that our parents were at least becoming a long term relationship so we agreed to try to stop our own sexual relationship.

That only lasted about a month when we were both wound up and horny and playing in the pool. Fortunately for us our parents weren't home to catch us having very hot sex in the pool which soon turned into hardcore sex in the living room with us screwing in almost every position possible. We finished in the shower with me swallowing my step brother's cum.

Six months later our parents got engaged but we knew we couldn't give up our desires for each other so we just continued to be secretive and have sex whwnever our parents weren't home.

After high school, we were both accepted to the same college out of state so we moved together and shared an apartment. All these years later we still share an apartment together. And with the exception of when family or friends come visit, we share the same bed too.