She was scared for him.
Harry had been moping aboutsince Sirius' death; most of his time he spent in his room. But soon he would not be able to close himself off as effectively as now. The day after tomorrow they would be boarding the train bound for Hogwarts and he'd be forced to be sociable again.
Most people could get away with hiding themselves away, but not Harry. Famous Harry Potter, saviour of the wizarding world and depressed teenager.
She had not meant to walk in on him that day. Granted, it was his fault, using a silencing charm without a locking charm what was he thinking? The obvious answer was that he was not thinking, just stuck in the depressed funk he'd been in for the past 3 months.
She'd walked in on him when he was in the shower; she had recently been pranked by the twins and now had thick green goo all over her face. She felt her way up the stairs of Grimmauld place found the bathroom and washed her face. When she finished, she looked up and saw the condensation on the mirror. She cleared it off to see if the goo was gone, and she saw behind her sitting in the shower stall a very naked and wet boy-who-lived staring at her blushing and covering his left wrist with his right hand.
What drew her attention more than anything else was the large amount of crimson covering the lower half of his body and the floor of the shower stall.
He looked at her pleadingly "Hermione, please don't tell" He said quietly as he summoned his wand from the bathroom counter and healed the cut.
She was so shocked all she could do was nod. He re-assured her that they'd talk later and she swiftly left the bathroom, taking the razor with her.
After dinner, Harry signalled for Hermione to meet him in his room. When they got there, Hermione was quiet and refused to meet his eyes with hers.
"Why…" she whispered, unshed tears sparkling in her eyes.
Harry did not answer; he just took her into his arms and let her cry herself out.
After that, they talked for what must have been hours, about the abuse he'd gone through as a child, about the prophecy and the pressure he felt, about his newfound fear of the opposite sex… or at least of the human-hosepipe variety, and of course about Sirius. All this time, he never answered her question, why?
"Because it's something I control," He confessed when she asked him again. "All my life I've been told what to do, first by the Dursleys, then I get to the wizarding world and I have to kill Voldemort… the man who has killed everyone I've loved."
"Everyone you've loved? What about Ron, Ginny… Me?" she added quietly. She looked into his eyes and found herself locked in his stare. Her heart began to race in her chest and her breathing became shallow, but she could not tear away from those emerald eyes.
Then he kissed her.