My Deep Dark Secret
My younger sister is my daughter, and I have a black son the same age.
I walked in on my mother and her black domme doing this whole lesbian bondage thing. She had me mount mom and her, and mom didn't object (or maybe she did, she had a ball gag on). This became a regular thing, and eventually both became pregnant and had babies within two days of each other.
The kids are now dating each other, which is cute and hot. I told her that he's a good guy and got her birth control pills and said it's all right to "have fun". I walked in on them during oral s** once.