Can't you just be yourself instead of asking strangers how you should "act" ???
Lick him and purr
Fortune cookies are simple to bake. You can find a recipe online. Write your own message and place it in your fortune cookie.
sign the prenup?
I think it is cheating if you know he is going to ask, when, where and how... its not really a proposal at that point, its a formality.
counting your chickens before they hatch, aren't you?