If we buy treats or snacks my wife and I have to divide them up prior.

"Okay so it's agreed, these ones are yours and these ones are mine. We can each eat our own however fast or slow we want but if we touch the other persons treats, it's shame and eternal damnation for the rest of our lives."

Looks at partner.

Partner nods head. "Yep. Agreed"

Shake hands.

Both turn and run away to a corner of the house like smeagol with the ring of power

And that is pretty much a true story.