What about keeping it airtight and at body temp for a few hours?

I plan to try this: have a thermos bottle mostly filled with water that is just below body temp. Then JO into a resealable snack baggie, remove as much air as possible leaving only cum in the baggie, zip up and put in the warm water. Can use cooking thermometer to check temp and top off with hotter water as needed, so as to keep it at same temp. It seems like it should be okay after an hour or two.... when i am ready to consume during next JO session... Anyone try this?