Hermione did not make it

Hermione kept on running, but suddenly she was overcome by intense pain. She hunched over against the wall as her breasts changed shape, becoming slightly bigger than before, and before she knew it, all she could think of was serving Harry.

'Where am I going? I should be with Harry!' Hermione found herself saying, turning back towards the common room.

Meanwhile, Harry was on top of his bed thrusting himself into Ginny.

"Harry, please, get out of me!" she said, while pushing back at his cock and moaning.

"I can't... stop! Someone help us!" he said, as he felt himself approaching orgasm.

"What do you want me to do, master?" Hermione suddenly asked, entering the room.

"Oh, god, you couldn't get to the lab in time? Stop me from having sex with Ginny, please!" he asked, but it was too late.

With a groan, Harry's cock throbbed and he began blasting semen into Ginny's insides. Ginny collapsed on top of him, and at once the changes began taking effect; Ginny grew slightly older looking, and her breasts expanded as her body shape became more sensual.

"Master, you don't seem to be giving off your odor any more. The book said that the pheromone of Sirius becomes permanently instilled in the owner's cock once it orgasms twice, and though it must activate at least once a day, the master can learn to control it pretty easily," said Hermione, as Ginny completed her transformation.

Harry pondered to himself. Since it was permanent, he may as well make the most of it.

"Okay, girls, you're sleeping with me tonight," he grinned, yet since he was too tired to have more sex, he instead fell asleep with a girl curled up near each of his arms.