Cassian chastises himself when she frowns, evidently the smile was again too much. Clearly the best way to win her over is to leave her alone, but he doesn't think that's going to go very far in the getting to know her department.

She looks away and digs around for something, and Cassian frowns himself, turning from the mirror now that he's satisfied with his hair. Maybe she'd be happier if he frowned more, who knows!! It's frustrating.

But she really does look beautiful. He's found her at times both adorable and pretty, depending on what she's doing, and even though she doesn't seem particularly comfortable all dressed up, she's managed to play herself up perfectly. The bare expanse of her shoulders into her arms, highlighting how goddamn jacked they are? He thinks she could probably lift him dead-weight.

He's still frowning a little when she finally looks back at him, and his gaze drops from her arms to his own chest, and he starts fiddling with the tie. He knows how to fix it, but maybe if it looks like he's struggling he can get her to come and do it herself in his incompetence. "Black is a good color."

He resists the urge to add on you at the end, but there is a small implication of it.