Give him a nice XXX-rated RPG!
As you are broke, you go shopping for some nice hand-cuffs and a nice game you like to play, too.
On his birth-day, you can combine that nicely and he he'll want you like crazy.
Tell him, it's present-time and he has sit on the bed with the eyes closed, cause you got something special.
a) hand-cuff him to the bed
b) get out the game and ask him things like: "wanna play with me?"
c) insert the game and play a bit for yourself. If you are good @ faking orgasms, fake an orgasm while doing it.
d) okay. this should have got his attention. It's time for phase II now:
e) insert some music along the lines of "workin' for the weekend" (okay, I guess you can do that better) and do a nice, slow strip tease for him
f) tease him with the clothes/underwear and ask him to do funny things he just can't do because of the hand-cuffs... like: "hey! It's your birthday! I'm your present! What's wrong? Don't you wanna touch me? *tease-tease* "Oh, come on... I know you want it!" *tease-tease-TEASE* I think you get the idea

g) at this point you should consider leaving him in a state of highest arousal and messing a bit with his family/job/life/friends/credit cards
But the point is: You must come back the other day for
h) []
And always remember: Simply buying your way out of it is always cheap. No matter how much you spent.