Blow Jobs 🤔

My boyfriend and I have a great relationship. But I can't remember the last time I gave him a BJ. This is partly because he usually seems to stop me halfway through and then we have sex. And also because he said that the first one I ever gave him "wasn't great" and now he says I'm "not bad" at them! I don't like doing things I'm not good at, and I do know what he likes now....but because it's been a while I've made it into a bigger deal than it is , I'm just worried about sucking at it (ha!) Help? I don't think I can get away without doing them forever! And I'm worried he stops me half way through cos he doesn't like it 😣 (I've never had complaints in the past but I'm not sure if that was because I was good or the guy just didn't want to be honest with me)