Why prolong 'em? Are you crazy...squirt your clit off and enjoy every minute.
I hope your husband has a wet suit!
If you think you're getting way too sensitive, then make sure you spend more time working out on perfecting the "ultimate blow job" for him or other ways he loves to get off.
Ladies: Let's not be selfish.. (Great post BTW!!!) And go for it. I wish I had the problem you two have!!!! /me so envious!/