Well, sandra...Something to remember is that every man and woman is different, so therefore with each partner you are with, both of you must work towards a compromise in your sexual habits. My partner and I have grown with each other tremendously, but that's not to say that I don't do or know something that would make her toes curl and her hair stand on end, and vice versa.
The fact that you are comfortable, and like, giving oral sex is a very good thing. It might seem stupid, but trust me, it is a good thing. What I would advise you to do is ask your sweetheart what kinds of things he likes or dislikes. When you are tasting him, ask him if he likes it a certain way. If he doesn't give an answer, or says "i don't know" and shrugs, then experiment a little. Chances are that he will like you to experiment, and you might even find a nice little spot on his body that he never knew could make him feel good at all.
A lot of guys fall into the bandwagon by saying "oh man, I would love to cum in my girl's mouth..." well....It's a mental thing. Yes, it turns me on to think that my girl would do that, but it's not because it feels any better for that to happen, but because, in my mind, for my girl to take it to the end with me is very appealing, and it turns me on.
As far as you being ready to taste him when he's coming, take your time. The worst thing to happen in a relationship is for something to be rushed, just so someone can get their rocks off. If it happens that way, a bunch of bad feelings will be harbored, and it could possibly ruin what great sex life you two have together already. Take it slow and easy....If he isn't alright with it, then he should find a way to get alright with it, eh? :d
when you are ready, i, for one, cannot cum simply by being tasted. Rather, I need a mass of stimulation. I loooooove my stomach to be kissed and for my nipples to be rubbed. Or alternate those two in between tasting me....That really turns me on and takes me over the edge quick
anyway, sorry for the long answer. Hopefully I have helped you a bit. I'm sure some other people have some other suggestions for you, perhaps some better! Good luck, and have fun =)
blake