Aunt Petunia screams.

That's not unusual, but it does mean Harry's done something freakish.

Now he's in his cupboard, in the dark.

It's been a while since he's last been locked in.

It's stifling hot. Sweat trickles into his eyes.

He wonders what he's done this time. He doesn't think he's done any accidental magic.

He finds out when they let him out to use the loo.

Black. His eyes are black.

He stares into the mirror and doesn't understand.

He stays in too long. Now he's in his cupboard again.

Finally he sleeps.

His dreams are full of screaming.