Hint that you don't mind some contact with her cock (Neutral route)

"I don't have anything against it...you don't have to hide it away from me or anything." You speak with sincerity, giving away your lack of aversion towards Arya's cock, if not anything further.

Seeming delighted and relieved all at once, Arya hugs you tightly, her throbbing bulge pressed up your much smaller, though no less excited one. You can practically feel each other's excitement, leading to a feedback loop of arousal, until Arya lets out a small groan.

You know what the source of her discomfort is without having to ask; her underwear and shorts are just not sufficient to contain the behemoth that you feel stirring inside of them.

You can't just let her suffer in discomfort, so you'll either have to downplay the situation by excusing yourself, or let it escalate by encouraging Arya to figuratively "release the beast".