If the idea of blowjobs or taking some nice warm cum on your face offends you, this is not for you. For me blowjobs are a beautiful thing. Slow, romantic, rough, submissive, dominant - there's so much to blowjobs it'll be impossible to write everything down in one go - so this is about the rough type. Girls, you'll need to be submissive to enjoy this fun.
This isn't about you teasing him, you being in charge or anything of the sort. This is about him grabbing your head and ramming his cock repeatedly down your throat while you gag and splutter on it.
First: all women can deepthroat. Men love it so learn to do it. It's just not fair to keep it from him just because you gag a little, the look of pleasure on a man's face, his eyes rolling back as your lips reach the bottom of his shaft is worth it and if you can do it no man will leave you (unless he's a complete idiot). Sorry if this sounds sexist but it really isn't that hard a thing to learn to do (and you'll probably get jewellery more often).
This is where being close helps, the only way you're going to be get used to having cock down your throat is to take cock down your throat. People say use frozen bananas but having something cold down my throat just sounds painful.
Put a towel on the floor by the side of the bed, there's going to be a lot of spit. Lay on your back with your head hanging off the side of the bed, this is probably the easiest position to get throat fucked in. After a few throat fuck sessions you'll be able to give deepthroat pretty easily as your gag reflex will be better trained.
Have him stand on the floor and push his cock into your mouth, balls deep and keep it there until you need to breath. After doing this a few times let him fuck your throat. You're going to gag and splutter, don't worry about it. Lots of spit is all part of this so gag away. It'll often feel like your going to be sick, just go with it, fighting it will hurt. Most of the time it's just thick spit and nothing nasty coming up BUT if you are sick, stop - clean up and either get back to it or do it another day. If he wants the pleasures of your mouth he's going to have to put up with it. Hopefully you're both mature enough to deal with this.
When he's ready to cum I suggest having him pull out, open your mouth and have him jerk himself so he shoots into your open mouth, he'll still get some on your face so you get that sensation as well but you also get to taste it. You can either swallow it down or let it dribble out over your face, both are great.