Well, I know one, for once.
This is
Without Checking The Water Level by ML Thompson (and a really great fic).
Next snippet:
The bus had been half empty when he'd got on, yet he'd chosen to
sit right next to her. She'd been looking out the window at the
time, just like she was now, and had flinched when she'd felt him
thump down heavily beside her. She hadn't dared look at him, but
she knew this for a certainty: he hadn't needed to sit beside
her.
Which was why she knew he was after her.
She stared blindly out of the window, rigid with fear and totally
at a loss as to what to do. The bus reached her stop but she was
too scared to get up and push past him. She didn't want him to
know where she was going. He'd follow her. Walk into the clinic
behind her and then find a way to hide until she was alone.
Happy guessing
Julie
