That's what Emily tells him.

"What do you want?" he asked her, quickly closing the window of his browser on his computer.

"Time for your treatment, bro." She told him, showing the tube of ointment and a pair of latex gloves.

"But I already got it today! At the hospital." he complained.

"Yes and you need to take it three times a day for the next two weeks. Doctor's orders." She told him.

The protocol was actually for one application every 48h, the shrinking was expected to reduce his size by two or three inches. Emily didn't see the fun in that. She had spent the whole afternoon scanning, doctoring and reprinting the instructions that she had received. The doctor had not given any more details about the treatment during her examination. Her mother and brother only knew that she had received the instructions. The folder was very clear that an shrinking caused by the **** was irreversible and had two pages of thinks to avoid while under this treatment with their associated side effects. To Emily they looked more like a list of cheat codes than warnings.

"Come on, don't be a baby and strip." She ordered. After coming home from the hospital he had discarded the ruined clothes and after a long search found some undamaged t-shirt and boxers to wear.

Knowing that her next move would be to call his mom, he removed his clothes and sat on his bed. So far his cock didn't look smaller, but it was completely flaccid and a bit more floppy than usual.

Emily put on the gloves and started massaging his junk with the cream. Even if it was his twin sister, it would have been a very sensual thin that ordinarily would have had him hard in seconds and cumming not long after that. But this time it had no effect except for the pain of his sister being too rough on his balls and the slight chill from the cream slowly drying.

"There, all done until tomorrow."She told him. " She told him. "See, it wasn't that hard!"

K-T resented the cruel pun, but was unaware of what his sister was really doing. He was only convinced that she enjoyed making fun of him because of this. He grabbed his clothes to put them back on.

"Don't do that. It said in the instructions to let it air dry as long as possible before covering it or washing it off. And it can leave white stains on fabric that won't go away in the wash."

K-T didn't like the prospect of staying exposed like that each time nor that the only other alternative was to have all his clothes have what looked like permanent cum stains on the crotch.

The next day was Sunday and she delighted on waking him up very early for his treatment. The cream took a while to dry and K-T was fearful that she was using too much of it, only by a huge factor off compared to reality. He had so much homework that between the dry off periods and studying he spent nearly all day in his room, trying to focus on anything else than this. Emily had taken his ruler, saying that she would need it to measure him and that she didn't want to use her own school supplies on his cock, so he couldn't be sure if it had already shrunk as he feared.

Woken up by his sister's alarm through the wall and cursing his early bird sibling he suddenly realized that it was now Monday, he had school and he hadn't considered at all that he would have to take his treatment at lunch...