You are doing a fine young woman or something resembling one, in the ass and you are ready to blow your load. You mysteriously are able to piss in her anal cavity first, then blow your load afterward. You then further continue to squeeze her belly from behind, possibly like a slow Heimlich Maneuver, and observe the beauty as the lovely mixture within said anus, bubbles out like a fine champagne with a frothy beginning/head.
I was going to use real champagne and the bottle up her ass like that video we saw earlier but I opted to go forth with a Golden Maggie, it is safer in regards to PSI (a shaken Champagne bottle may be too extreme), and I ain't goin out with blue balls tonight!
Prices shown in USD.