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Snape looked at Harry over the top of his reading glasses. "What, pray tell, is that, Potter? Is that an erect penis?"
Harry pulled at the collar around his throat.
"Have I given you permission to become aroused?"
Harry shook his head, his eyes defiant.
"Come here. Kneel."
Harry crossed to him and knelt. Snape winced inside as he heard Harry's knee creak, though he showed no emotion. Aurors rarely retired with all their body parts intact. He ran a hand through wayward grey locks, grabbed a handful, and pulled Harry's head back. "What shall I do with you? You know that wilful arousal is a punishable offence."
The pupils of Harry's eyes dilated and a flush spread across his face. Snape narrowed his eyes. "That makes you happy, I see. Unacceptable. I believe that your punishment shall be to watch me masturbate myself. You may not touch me. You may not touch yourself. If you follow these orders, I will spend myself on your face and you may lick yourself clean."
Harry's eyes drifted closed and the deep lines of his face relaxed as he waited.
Snape looked down at him with approval. And, perhaps, a bit of love.