It was his birthday and I know that he has always been horny for me.
I always noticed his glances behind my back when he secretly looked at my ass. Well, maybe sometimes the skirt slipped a little higher than it should have... by mistake of course... ;)
Anyway, now that it was his birthday I told him I had a special present for him.
He didn't know anything, I just told him he had to blindfold himself and be surprised. :)
As he sat there, he probably guessed what was in store for him, because a massive bulge formed in his trousers and at that moment, it was all over for me and my brain shut down ;)
Imagine it was your birthday and I surprised you like that. How would you react? :)