Naps.
She never really had a soft spot for naps. For years and years, she saw naps as wastes of time, that they'd take up precious moments in the day. She even found them bothersome since she'd never be able to go to sleep that evening, but she wouldn't be able to stay attentive enough to be even a bit productive. She disliked naps, that was, until she met him. Now, she freely naps by his side. She won't admit it, but the warmth that they share is enough to make her slowly grow fond of naps. That bit of company, that tender warmth draws her in deeper and deeper every time, making her love to hate taking naps, but knowing that she secretly loves the comfort. She is able to forget her stresses, even if it's only temporarily, when she naps by his side.