Girls is sucking a dick tiring?

Needless to say i haven't sucked a dick not even the guys I've went out with. They begged for it though, but i just didn't feel like sucking the thing. I like this new guy and i kind of want to suck his dick out since he’s everything i want in a guy. Im super lazy and gets tired easily so just wondering if its tiring because it looks like it. Also should i practice on a different guy first? I dont want to disappoint my guy. I could probably practice on a friend im positive he’ll say yes and will keep it a secret if i ask him to.
Girls is sucking a dick tiring?
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