@Yodaman, I guess I can give you some
serious advice.
(surprising, right?)
But, the way I see it, your best friend is hot and in love with you. This means you obviously get along well since you're best friends in the first place. But I'm guessing you feel this sudden love confession will ruin your friendship or some such? I can understand why you fear for this happening...
Listen, I think you should make a deal beforehand to not let this interfere with you two being friends. Then if you feel you should, want to, or simply wanna give it a chance, do so. It might work out for the best.
Serious advice really, really, hurts.