Am I wrong to back out of a sex bet my fiancé and I made with another person if it seems likely we’ll lose?

I’m from Seattle and my fiancé is a 26yo bikini barista. We made a bet with a spoiled rich thunder fan from OKC that they wouldn’t win the championship and if we win we get $10,000 but if he wins he gets to fuck my girl in the ass. Now I’m realizing it was not a smart bet.

Am I wrong to back out of a sex bet my fiancé and I made with another person if it seems likely we’ll lose?
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