>>82148515
It's quite literally the Oedipus tragedy: truly one in many millions. To that anyone can say: "you didn't know."

The story has been a little vague. Could you clarify?

You said you took him to bed on the first date. Does this mean all the details that started clueing you in to your blood relation came piece by piece later?
Could you describe the sequence that made you fully realize? Was it only you that realized? Did you have to be the one to tell him?
What do you want to happen in the future with your relationship?
Does anyone else know? Could anyone else know or do you believe the fling will disappear into forgotten anonymity (ie: we went on public dates but never posted on social media. never appeared as a couple to mutual acquaintances)?
Why post here about it?