Our special relationship

I'm a guy, currently 24. I have an older sister (30) and we both come from a large extended family, many cousins, uncles and aunts and such (just from our mother's side, my father bailed after I was born and his family never reached out). Out of them all, my sister and I got along particularly well with one of the older cousins, let's just call him "Mark" (33). Things were fun when we were little, he played with us a lot. But things started to change as we got older.

I was 14, and most of the family had gathered for Christmas Eve. It was a very large house, the kind that are basically ranches (a few of the uncles were rich). We were all supposed to be at the living room for opening presents, but my sister and Mark were missing. My mother sent me to find them. I had spent a lot of time looking inside the house and got nothing, so I went outside. My uncle had a wine cellar, so I went to check there... and heard moans. Under the dim light I could see my sister, almost totally naked, riding Mark.

I have always considered my sister an extremely attractive woman, but always in a platonic way. Seeing her that way, moaning and touching her breasts and pussy, changed everything for me. I noticed my erection and felt embarrased at first... which is how I bumped my head into a barrel and gave myself away. They were alarmed at first, but my sister calmly stopped me before I could escape. They tried to convince me to keep quiet, saying that their relationship was as honest, respectful and loving was before, it had just changed a bit.

Out of the blue, she approached me and said "let us show you", kissed me and started rubbing my crotch. I didn't stop her and, before I knew it, we were all on the floor, Mark penetrating my sister from behind while she kissed me and jerked me off. I saw my sister orgasm and fell in love with how she gasped and shaked while my cum dripped between her fingers. And that was that, our relationship had changed forever. A few days later, while we were alone at home, she slipped under my sheets one night and took my virginity.

The three of us have been involved in this sexual relationship for a decade, sometimes its mostly me and my sister, other times its mostly Mark and her, or a few periods of time when we can't even make time to meet. All of us have had other relationships on the side to keep suspicion away, but the truth for the three of us is that our telationship is the most exually fulfilling. I once dated an older woman with an intense craving for sex: didn't even come close to the kind of pleasure I feel when I'm with my sister.

About a year ago, she and Mark moved in together, supposedly as roomies. They've always got along great, so our family thinks they're just each other's favorite cousin, though they're getting a little uneasy about them being unmarried at their age.

And I also spend a whole lot of time in their appartment, obviously. Thing is, my sister is pregnant now, and from the timeline, it can only be Mark's or mine (recently we fuck her together most times). Still wondering if we want to keep it.

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