*

Sirius fumbled with the lock on his bedroom door, thick fingers dropping the key. He had asked Kreacher to stand guard outside, for good measure; there were so many Order members staying over that night.

A tabby cat slunk out of the shadows of his tattered curtains. In one fluid motion, Minerva returned to human form - but now, she was wearing her teaching robes, in the style of fifteen years prior.

"Oh, bloody hell," Sirius breathed, already half-hard.

"Come along, boy. I don't have all day."

Minerva stood tall and upright in the middle of his bedroom, and looked at him, appraisingly. "Remove your robes, please." It was a request that brooked no argument.

Meeting her gaze like the lippy schoolboy he always was, Sirius shrugged off his outer robe, trousers and shirt.

"And your underwear. Don't test my patience, Mr Black."

Sirius groaned a little and obliged. He was fully erect now, and beginning to leak.

"Now, touch yourself." With a darting tongue, Minerva licked her bottom lip.

Sirius' eyes widened a little; gods he was loving this. He started his stokes slow and even, but quickly picked up the pace. All the while, he focussed on his Professor's watchful stare, feeling more and more aroused by the second.

He was getting close, now. So close, and...

"-Stop." When Sirius carried on wanking for a moment longer, Minerva's tone became more severe. "I said, stop."

Sirius whimpered, but did as he was told. His cock was throbbing-hard; he felt almost like sobbing with the denied release.

"Touch my breasts." With a wandless charm, Minerva Vanished all of her clothes. She still stood perfectly upright, her wiry frame as imperious as her voice.

Sirius took a rattling breath, and tried to move. He stepped forward and gingerly rubbed one of her nipples, revelling in how taboo it seemed to do so.

"With your tongue."

He blinked. Then, emboldened, Sirius lunged forward to suck and bite.

Minerva gasped, and her eyes fluttered closed. "That is... satisfactory."