Ask for some visual assistance

"Arya, your clothes are making you look remarkably dowdy. I'm going to take them off you and I'd like you to remain standing, as you are, whilst I continue."

The statement takes her by suprise and her mumbled, confused, and not unwilling, reply takes all the time needed for you to stand and clear the distance between the two of you.

Taking her chin with one hand, you **** her into locking eyes with you, whilst your other hand begins to unbutton her blouse.

With a whisper of fabric, Arya's clothes fall away, leaving her in naught but a thin, revealing shift.

One further look from you implies all the necessaries, and you move back to sit on the bed, as you watch your youngest sister slowly, dutifully, remove the last of her clothes.

Standing before you, as naked as the day she was born, Arya's nubile body is clear to see. Her small, rosebud breasts carry a faint trace of sweat, whilst her young, supple curves trace her outline to her waist, where you can make out a hairless mound. You begin to feel your manhood engorge even more as you meet her gaze yet again.

"D-d-d-does this please you, brother?"

You remain silent, and continue to slowly massage your cock in front of the teen Stark.