What is your opinion on a doubles session where one provider is in 40's and other in 20's? I've been tossing around idea.

Do it! I have seen providers that do it in the past or come close to that spread. You will have to do some digging to arrange. If you're lucky, one will respond here.

and I think it is very HOT!

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what's your friends handle?  Sounds intriguing.

Having two women of major age discrepancy playing with one another is incredibly hot I find... especially when the dynamics are that of the older woman leading the younger women. Hot.