I want to make him moan. help me out?

So i finally was able to give my boyfriend a blowjob. the whole time he didn't make a single sound! no breathing heavy or anything! I'm very vocal and i just want to hear something out of him to know he's turned on. i know i need to work on my technique so do you have any tips? not only on blow jobs but other ways to make him moan without actual sex?
I want to make him moan. help me out?
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