See...that's the thing. You weren't coerced into something and you found your grove with it.
If I'd EVER felt like he was trying to 'talk me into it', it would never have happened. He mentioned it once, then after that he only made very occasional, very subtle hints that he was still interested in trying it. No pressure at all. We both got lucky when I discovered that I enjoyed it.
That's one of the worst parts of it all, I would hate knowing it wasn't something that she wanted as well. Part of the whole experience is a mutual want!
In my case, with the example I used (first time anal), it WAS a mutual want. While I didn't want to try anal, I DID want to make him happy. I considered it to be worth one night of what I thought would be physical and mental discomfort to at least give it a go. If I'd hated it, it wouldn't have happened again. As it turned out though I enjoyed it, so there was more in the future.
My advice for the OP based on this:
1. It is POSSIBLE that sucking cock may grow on your gf in the future. If you want to maximise your chances of that happening, BACK OFF. Make sure she knows that you love bjs and then back off completely and leave it up to her. And don't just think that not mentioning it for a week or two counts as backing off. You need to back off permanently and create a no pressure situation.
2. I actually think it's highly unlikely that her opinion of an act that she has already participated in more than once will change significantly. It is more likely that she will give you less bjs as time goes on (for reasons given by others in this thread). You need to make a decision. IF it turns out that her dislike of giving bjs stays the same or grows even stronger, can you live with that forever? It's a yes or no answer. If you can't live with it, you shouldn't be in the relationship. If you can live with it without complaining or resenting her, then go for it, but don't complain in 5 months or 5 years when you aren't getting any bjs.
Side note not aimed at the OP in particular: Why on earth do people enter relationships with others, then expect them to change???