Sherlock, himself, has up until now mostly thought of both love and sex as something that happens to other people and not him. Which means he's been fairly dismissive of how passionate, how lost people can become in their relationships. But now, twined close and caught up in something that's a mixture of deeper trust and acceptance and compassion than he's ever experienced... now it's starting to make sense, why John needled at him so much before Sherrinford about finding someone.

He feels human with Molly, and for once that isn't a liability.

Carefully he tugs the knot loose, his fingers sliding over the back of one of her hands as she's freed. Even as he feels her lowering her arms, he relaxes, slumping to catch his breath.