Reluctantly

At her uncle's command, Harry hesitantly lifted her hand up towards his cock and froze midway. "I-I've never-" she began with a stammer before abruptly falling silent under her uncle's incredulous gaze while feeling a hot blush on her cheeks.

"You're either the world's best liar or the most innocent tart..." muttered Vernon, though his tone didn't sound displeased at all. He then laughed and took hold of his hefty cock and slapped it against Harry's cheeks, "No time like the present, then. Why don't you give it a little kiss."

Though it was phrased as a question, Harry had had enough experience with Vernon to hear the underlying command in his voice. Oddly enough, the forcefulness and order itself sent a pleasing warmth throughout Harry's body and helped ease her.

'A-After a-all, there's no way I'll be able to reach my wand before he catches me, so...' It was a flimsy justification, but it was enough for Harry to rear her head back slightly, pucker her lips and plant a chaste kiss on the head of Vernon's penis.

"Like...like that?" Harry wasn't even sure at this point whether or not she was asking if that was enough for her uncle or if she was asking if he liked the feel of her lips on his fat cock. Of course, based on the scowl that Uncle Vernon was sporting, it seemed pretty clear to Harry that the answer to both of those questions was "No.".

"No! "Not like that"," snarled Vernon, making mocking little air-quotes with his sausage-like fingers as he repeated back Harry's words. "I meant a proper kiss. Not this namby-pamby tripe you get up to with my freak of a nephew! A real kiss should be with tongue and some goddamned passion!" Uncle Vernon seized her painfully by her hair and shouted in her face, "Now do it again!"

Ingrained instincts of cowering before her angry uncle and submitting to his demands kicked in for Harry as she took a firm hold of Vernon's shaft ('My fingers can't even wrap all the way around it!'). Wetting her lips nervously, Harry once again kissed the tip of her uncle's penis. This time around, she didn't immediately pull away and instead hesitantly extended her tongue to lick the smooth and veiny head. A small trickle of clear fluid started to leak out with her actions and made it's way onto her tongue. Rather than the revolting taste she was expecting, Harry found herself quite enjoying the slightly salty substance and became more bold with her movements.

"Better. Much better." grunted Vernon with something that sounded close to approval. "But you're still going too slow. Especially for a prostitute."