How to store cum

My wife is insisting that anytime I ejaculate I store cum for later use to lick off her pussy. What is the best way for it to maintain its fresh form

The only way that I know of is to freeze it; however I've "heard" that freezing changes its taste somewhat.

Freeze it in as small a container as possible, as soon as possible. Air oxidizes it and latex condoms will flavor it.

The best is to use pyrex test tubes with a butyl rubber stopper, just like laboratories do.

She can then warm the test tube in a water bath for a few minutes and pour it out accurately.

Think test tube shots of cuckold water at the club...

This was a quick search. Sure there's cheaper and smaller qtys somewhere.

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Can't you buy them ready filled?

My wife uses the small plastic film containers ( for photographic film ) that easily pop into her handbag whenever she meets one of her lovers. she lets his sperm drip out of her into the container to "bring home to me".
you could easily pop it into the freezer to later defrost ! ;)