Ideally a humor story.
A guy (the narrator) is married to a woman. He knows she is Bi. He has the magical ability to change gender. He has never told his wife about it. He decided to have fun with it, because he's a prankster. So, one day he changes form and starts hitting on his wife. She tells him (I'm using him for simplicity) that she is married. He says that it's no big deal. He says something to the effect of "Hell, your husband and I are really close. I doubt he'd complain, and I guarantee he won't catch us. We share the same parents. We've shared the same bed on many occasions. I don't see why we can't share you."
His wife is skeptical, but he gladly provides proof in the form of knowing about her husband's birthmarks (and even her birthmarks, including some in some odd positions). At this point, his wife is pretty pissed at her husband, but her husband's "sister" is quite beautiful, and cheating on her husband seems like an OK way to get revenge.
When she gets home, she confronts her husband, who claims not to have any siblings, but mentions that he does know who his wife is talking about, and that he has known her for a long time. His wife is quite fearful at this point that perhaps she's just been suckered into cheating on her husband for no reason.
He comments, "Don't worry. She wasn't lying to you when she said we were pretty close." At this point he transforms. "In fact, I was pretty honest in most of what I said to you yesterday. Except the part about not catching you. That was a lie."
A guy (the narrator) is married to a woman. He knows she is Bi. He has the magical ability to change gender. He has never told his wife about it. He decided to have fun with it, because he's a prankster. So, one day he changes form and starts hitting on his wife. She tells him (I'm using him for simplicity) that she is married. He says that it's no big deal. He says something to the effect of "Hell, your husband and I are really close. I doubt he'd complain, and I guarantee he won't catch us. We share the same parents. We've shared the same bed on many occasions. I don't see why we can't share you."
His wife is skeptical, but he gladly provides proof in the form of knowing about her husband's birthmarks (and even her birthmarks, including some in some odd positions). At this point, his wife is pretty pissed at her husband, but her husband's "sister" is quite beautiful, and cheating on her husband seems like an OK way to get revenge.
When she gets home, she confronts her husband, who claims not to have any siblings, but mentions that he does know who his wife is talking about, and that he has known her for a long time. His wife is quite fearful at this point that perhaps she's just been suckered into cheating on her husband for no reason.
He comments, "Don't worry. She wasn't lying to you when she said we were pretty close." At this point he transforms. "In fact, I was pretty honest in most of what I said to you yesterday. Except the part about not catching you. That was a lie."