Interesting question, the reverse of my tranny surprise question.
Well initially i suppose id be very disappointed as id be gagging to get my lips around her shecock by this time, but i love pussy so it wouldn't be a total disaster.
Id busy my face in that hot pussy and lick suck and drink down her hot juicy nectar until she creamed all over my face.
Then id probbly have to give her a bottom real good spanking for deceiving me like that and she wouldn't get off that lightly ether id spend the rest of the night dishing out various punishments, like burring my throbbing cock deep in her ass and forcing her to swallow my spunk, bad girl.