Look at it like this:
Oh Luvvy,Luvvy
You excited him so much, love, that he couldn't contain himself any longer, love. Now with a little more experience he will be able to control his reflex. Without experience he won't get any better, love. So I say be kind, be slow with him, and you shall be rewarded.
I can understand you are frustrated. Alternatively, you can go with some bloke with more experience or, simply, older. And if he sucks in bed, ask him to suck whatever it is you want him to suck.....