Thinking about this blows my mind still.

So, im a 31yo male. This part of my life happened from 18 to 27.

Ill start with my niece. at the time she was 10 & so is her friend. My niece & I have had a sexual relationship since she was 8. a lot of making out, and grinding until we'd both cum. but no penetration. just lots of orgasms.

Fast forward two years. my niece lives with my parents, and so do I. I am now 20, my niece and her friend are both 10. my niece and i have had lots of sexual play and orgasms over the past two years. Then one day my niece introduces me to her friend, and she instantly latches onto me, and so do I. maybe a month of hanging out, dropping them off and picking them up from school. we're all watching a movie and cuddling, and as usual my niece isn't wearing much, just the shirt i was wearing for the day and nothing underneath. so everything was visible. Im in my boxers and her friend is wearing one of my shirts and her panties. in the middle of cuddling my niece brings up sex, which leads to me taking my nieces friends virginity, at 10 yo. after the first time it became a constant thing for us. since they were best friends they were always together, so my niece would always watch and masturbate. Then one night at 11yo, when its just my niece and I at home. We're hanging out and after her shower she comes to me say she wants me to take her virginity. Which afterwards leads to more sex whenever it just us.

Now at 13 it gets crazy. my nieces friend & I decide to make it official. I got brave and decided to go to her house one night. successfully snuck in and had sex. but after, i was dressed & lying on the bed, she decides to stay in her tank top and panties. She wanted some water and decides to flings the door open, right as her mom walks by. which leads to a surprisingly calm talk about our age difference. But she was okay with it. after that, we started having sex EVERYWHERE. we did it in parks, day or night, beaches, the apartment gym, sauna, pool shower, the pool, random hotels, random spots in the backseat of the car, around the corner from her school right before she went in, the park attached to her school, right after she got out, sometimes skipping so we could have sex all day.

We dated until she was 18, got married. divorced when she was 20. she's divorced again and we are friends again.