[ The dresser. Right. He's a little shaky when he stands, glances back at her and leaves her with a small promise of "I'll be back in a minute". Granted, that might be more convincing if he didn't almost trip up over said dress with it laid out of the floor.

Ignoring that he keeps walking until he gets to the back. He finds the hair tie easily enough, but instead of going straight back out he takes a few long and incredibly deep breaths. His heart is still racing and he really has no idea what kind of reading Athena will get from this response but...

She does look like a princess, or as much of one as that dress and plastic allows. If he could, he'd transform it to gold for her--but without a stone of that kind of power it's impossible.

He pulls the hair tie onto his wrist and rubs his hands over his trousers, trying to clear his mind. He can do this. He can--

Walking out he immediately thinks he left too soon, but it'd be suspicious otherwise. ] Found it. [ Instead he steps behind her, hands reaching to take a section of hair from both sides of her face. ]

Hold this piece. [ As soon as she takes it he starts plaiting the other, getting half way before he holds that piece out for her to take. It shouldn't take her long to realise that he's plaiting two sides for her, eventually plaiting the both of them together to trail down her back. He starts explaining maybe half way through it. ]

I don't have the expertise for some of the styles the Lady Morgana or even Guinevere do but... this is closer to what they do.

[ She should be able to notice his hands are shaking a little while doing this though. Loser. ]