After a
large bowl of Wolf Brand Chili, commence to
having sex with the misses. (yours or anyone else's). In the doggie position, you withdraw and move to anal. Just at the moment of e-jaculation, push two of your fingers into her mouth.
This will cause her to vomit, which, in turn, causes all sphincters to tighten. Giving a very
pleasurable sensation.
Caveats:
You MUST tell her about this beforehand, so she does not bite your fingers off.
You must expect one hell of a Wolf Brand Chili Mess at both ends.