Third cousin, no blood relation at all.

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We went to college together and lived together so went out and got drunk often. Then one night we had sex as there was this weird tension the whole time because even though there was no actual relation it seemed taboo. So we would sleep with each other occasionally if we both struck out. It as a weird relationship because there was zero jealosy on either part when we would come home with other people as we knew there was no future in it and it was actually purely physical, only working "friends with benefits" type situation I have ever had, only she was my uncles (not blood uncle) brothers daughter.

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It was aight. Did not have any effect on us in terms of our friendship and everyday interaction oddly enough. Dont regret it one bit, its no big deal to me or her.