Teach her the importance of anal sex

"Well little sister you did a very good job, a very good job indeed! But using your mouth is the least you could do for a man. The primary attractions you have to offer are your pussy and sweet little ass of course.

In normal circumstances it would be more common to use your cunt. However, since we are siblings, its important we don't put a baby in you. That only leaves one hole left for me to use.

That's right Arya, I'm gonna fuck your cute little ass. Don't worry I'll be gentle and take it nice and slow with you. It will probably hurt, at least in the begining but I know you are tough and can take it like a real champ if you just want to.

So what do you say my little sister, will you let your favorite big brother use your backdoor to please himself or will you be a little bitch like Sansa? Whining about it being dirty and not proper for a lady to do."

This hit all the right spots in Arya's mind. She disliked everything her sister stood for. She did not want to be anything like her, she did not want to be a lady! No she wanted to be a knight, though, rough and hard as steel.

If that meant she had to take dick like a man (AKA in her bum) so be it. She was not gonna step down and disappoint her older brother that did so much for her. She would prefer to do it the normal way but if it was her ass that was required of her then it's her ass she would provide.

At this point she didn't even care that it might hurt. All she wanted was to prove herself, to be the toughest girl in town. Though enough to be a soldier, though enough to take dick up her bum without complaining.

She looked up at her brother his dick still resting on her chin half erect and said "Of course you can fuck me in the arse brother. I'm no brat like Sansa, i don't care if it's dirty. If you want to put your dick in my bum you can do that. I won't complain, I can take it, I know I can!"

Jon only looked down on her with a devious yet soft smile. He moved his hand down to her her face and petted the side of her face.

"Oh my sweet little sister how glad you make me with those words. It makes me hard again just hearing your eagerness to let me use your cute bum. I can't wait till I get inside and feel your warmth around my cock. Now get up on the bed on all fours and I will..."