1. The tongue is a highly effective organ when it comes to fellatio so use it. Go up and down his penis with your wet tongue, not forgetting to have a little nibble of the tip. When he can't take any more of this teasin it's time to take him in your mouth. For long lasting oral use deep long sucks but if you want him to ejaculate faster then short and fast sucks on the tip of his penis will make him orgasm in a minute.
2. Change things around, don't just wait for bed time then go through the by now boring, same fellatio. Challenge yourself to giving him head in every room in the house before the end of the week. The variety you are giving to him will increase his enjoyment and he will not be able to stop ejaculating from your oral sex.
Let's not overlook the fact that only will he think of you as his best ever lover but will also be more considerate to you in bed in order to pleasure you in return. On top of this comes the fact that any worries about him cheating on you will go out of the window because once a guy has found a girl capable of great fellatio then he will never leave her.
How to make men ejaculate when you give them oral sex