You convinced your wife to wear that skimpy bikini outside at the house pool. You started giving her drinks to get her to relax and now she is in a relaxed mood. Now you see your opportunity.
You called your friend to come over. He knows of your fantasy and has been wanting to fuck your wife for a while. He brings more drinks to keep thing moving smoothly. Fortunately, your wife is so buzzed that she has completely forgotten about her small bikini and, as expected, has gotten into a slutty drunk mood. You keep giving her drinks while your friend keeps grinding on her and feeling her up. She is drunk and loving all the attention.
Now comes the best part. Finish getting her completely drunk and let your friend carry her back to the bedroom. Your friend will be fucking your wife soon, and you will be fulfilling one of your fantasies. As far as your wife goes, she is going to get drunk again next weekend, guranteed.
Of course you lost the bet. And he resized your girlfriends holes…