We were all on pins and needles as we watched the Suns and Pistons play each other now. Sure, we all had our fun together and we all knew that we would be lovers, no matter what. Even so, a bet was a bet, and while I suspected that we would both fuck each other in the ass sooner or later, lifetime rights to do so were a pretty big deal. I would honor my word and I knew that Natalie would as well. There was a lot riding on this.
It was a very close-run thing, but just as we all tensed up, unsure of what to expect, I could tell that my twin sister tossed back her drinks at an alarming rate. Her nerves were particularly on edge, for one reason or another. Well, to be fair...her ass was literally on the line, but so was mine, wasn't it? She looked repeatedly at me, at Bianca, and at Aaron most of all. Sure, we swapped partners several times in the past forty-eight hours, but this would change her own relationship with her boyfriend forever and they both knew it. This approached cuckold territory more than the previous stuff for certain.
I looked at Bianca more than a few times myself, to gauge her responses, particularly once Lamont Rogers was given a chance for a foul shot that could break the overtime tie and win the game for the Phoenix Suns over the Detroit Pistons. If he made this shot, our lives would instantly change, including Bianca's. Her boyfriend would have a personal butt-slut who would happen to be his own sister. We would spend the rest of our lives dealing with the implications of that fact.
We all watched in pure fascination now, eyes glued to the TV set, as Lamont made that shot. It swooshed perfectly into the basket, past the rim, and went through the hoop onto the hardwood floor of the basketball court. He had scored! The Phoenix Suns just won the game and...I had just won lifelong possession of my twin sister's bottom! Natalie bit her lower lip, looked at me, looked at her boyfriend, and then looked at Bianca. Then she rose, knelt in front of me, and took my hands in hers.
"Master, you've won fair and square. My ass is yours. I have to confess that no small part of me is glad, too. Congratulations, bro. I'm now your anal slave for life! I will never renege! This belongs to you now, my dear twin," Natalie declared.
Then she planted a steamy French kiss on me with a lot of tongue and bent over to show me a better look at my prize. Her tight, toned, freckled, pale booty was in easy reach and I grabbed her butt with both hands. It was mine now. My sister's ass was MINE! It morally belonged to me, even though the deal was by no means legally binding.
I looked over at Bianca and then at Aaron, wondering how they would handle the change of ownership once reality set in for them. This was his girlfriend and her boyfriend now in an incestuous relationship with heavy D/s subtext here. Their relationships with us would not, could not ever be quite the same again. If we married, this deal would be baked into the cake already and we knew it. They would knowingly marry people who had an incestuous anal bondage pact with their own twin.
"Hey, I have no right to object, and in fact, I don't at all. I love that you own your sister's ass. Your TWIN sister, no less! In fact, I'd like to borrow it now and then, if that's okay with you, papi," Bianca told me at last, "this isn't cheating, any more than any of the other fun we four have had with each other in the past couple of days. It doesn't count against you at all. It turns me on that you're going to commit incest and sodomy with Natalie here."
