Rose liked Mickey; always had. They’d known each other practically since they were little kids and they’d made the transition from being just friends to dating almost without noticing. Mickey was a good guy and she cared about him, but there’d never been any real chemistry between them, not for her.
Then the Doctor had whisked her off on adventures and her life had become exciting, a non-stop thrill ride. They’d been nothing more than good friends though, until he’d regenerated into… this. With his untamed hair and manic grin he’d effortlessly captured her heart.
This was how chemistry felt!