Of course thats the whole point of the story.

Wrapping her hand round him, she stroked him a few times, feeling him surge in her hand as he watched her. Arya wasted no time, sucking firmly and taking him quite deep into her mouth, hearing him sigh as she closed her eyes and got to work. Her hand moved to cradle his balls, lightly squeezing as she started to work at him, taking only a couple of strokes to get quite a rhythm going, bobbing her head as she worked her mouth up and down his shaft.

"Finally putting your mouth to good use", Joffery cried enjoying his blowjob.

“Fuck you.” She answered keeping her glare at him. She decided to push it, and started sucking as hard and fast as possible, hearing him groan at her shift up in pace, sucking and slurping noisily at him, working her tongue on his shaft and pouting her lips as she did so, going down so he just bumped the back of her throat each time, accentuating her movements with squeezes of his balls, her other hand clutching at his thigh as she gave him a fast, trampy blowjob.

" Is that what you call a blowjob you better show me some reall skill of Lord Eddard is going to have a work with you on how you begged me for my royal cock down your throat."