That Night

With that orgasm, Jake's dick had decreased in size, from 7 inches to 6.5 inches, about 17 cm. It also became more sensitive, and his next load was guaranteed to be bigger than the last. Not only that but his body had slightly feminized. His but had grown a little, his waists and shoulders slimmed down, and his facial features were just a tiny bit softer. When dressed as he normally would, nobody would notice anything was different.

Jane waited till Jake entered his bathroom to clean himself off. She immediately ran to her room to inspect her now slightly larger breasts. They were still about B cups, but to her noticeably larger. She got her bra off and played with them.

"Oooooh! I can't wait to see how big they get! And how small HE gets! Hehehe!"

Jane grabbed the rulebook and added a new rule

"Jake cannot masturbate his dick alone. He can't quite grab his penis no matter how horny, but he can still anally masturbate"

"This should make sure he needs me tonight."

That night Jane was lying in bed, browsing Tik Tok and keeping an eye on the time. Somewhere around 12:20 A.M, she heard a gentle knock at the door, followed by Jake quietly stepping in.

"Hey." Whispered Jane.

"Hey." Said Jake

"Come get in bed with me" Jane teased.

Jake quickly but quietly tip toed to his sisters bed and sat down by her. She sat up and once again pressed herself against him the same way she did before. His now shorter penis bulged clearly from his underwear.

"I want you to do something for me, ok?" Asked Jane

"Ok."

"I want you to jerk off in front of me. I wanna see what that looks like. A pathetic loser cumming in front of his sister."

"Ummm. Ok..." Jake slid his undies down to reveal his fully erect cock. He still had yet to realize it had shrunk. He reached for his sausage and tried to grab it. But he just kinda didn't? He placed his hand in position around his cock, but he wasn't holding it? There was just a little space between his fingers and shaft. He made a conscious effort to squeeze his fingers onto his dick, but his fingers didn't obey.

"Ummm. I. What?" Jake kept trying and failing to touch his own penis.

"Is it usually this hard?"

"No. I'm super hard"

"No I mean to jerk it. You won't grab it!"

"I can't."

"What do you mean you can't?" Jane tormented him knowing full well why.

"I just can't grab it! What's happening!?" Jake shout whispered

"Here. I'll tell you what's up. I control you. From now on, you cannot cum without my help."

"What? How!?"

"I... I hypnotized you!. You're under my control, ok! But you can't touch it with your hands if you're erect. You'll need my help getting off from now on."

"What? How am I supposed to believe that?"

"Go ahead. Jerk off."

Jake tried moving his hand up and down, but it simply stayed a small distance away from his dick no matter how he tried to position either it or his hands.

"And every time you cum, you'll cum a little faster than last time."

Jake's cock twitched, begging to release.

"Every load you blow for your favorite sister, your penis becomes smaller and your body becomes more feminine. But no matter what, you can't stop crawling back to me. Want some proof?"

Jane grabbed her brothers cock and it immediately sprayed a larger than average cum load all over her hands and his now shrinking dick. She quickly let go, "Ew!" mostly ruining his orgasm. He instinctively tried to grab it to finish, but simply could not. He sprayed a little cum into his hands. His dick had shrunk another CM, now 16cm about 6 inches. He was definitely going to notice how small it's getting by tomorrow.

"Jesus Christ you're so disgusting! Get out of here before I scream for Dad! "

Jake was extremely confused why she'd do that given what just happened, but he wasn't chancing it. He quickly ran into his bedroom and never washed his hands. He was too scared he'd be caught.

After Jake closed her door, she licked her brothers cum off her fingers and began playing with her breasts once again.