Elsa Kristoff and Anna were playing a game, and the loser had to do a bet. "So, what is the bet again?" asked Elsa. "Whoever looses this game, has to be tied up and gagged in their underwear for a week, only bathroom breaks to be let out." Kristoff said, "I'm not in on the bet. This is just between you two." Elsa smirked, and said, "Very well."
Soon, they were finished. "Nice, so Olaf, who had the most points?" Olaf looked at his chart, and said, "So, Anna had 10, Kristoff had 16 and Elsa had 9." "Elsa lost!" said Anna, "Now you have to do the bet!" "Does it have to be in my underwear?" asked Elsa. "Yes, rules are rules Elsa." Elsa sighed, and the two headed off to her room.
Anna got out the rope, and Elsa was now stripped to her bra and underwear. "Okay, are you ready for this Elsa?" "Yes, let's get this over with." Anna then put a neckless on Elsa, and said, "It's a special charm from Grand pabbie. He said it could block the powers of anyone. I suspect that this will come in handy."
Anna then grabbed Elsa's hands, and tied them together. Anna grabbed a new rope and wrapped that around her breasts in a harness tie. She then pinned her sister's arms to her sides. Next, she got some string, and tied it around Elsa's breasts, making them bulge out a bit. "AAAHH!" said Elsa, "Anna, that's a bit much." Anna just tied the loose ends together behind her back, and said, "I don't think your in any position to give any demands missy."
Anna then grabbed a new rope, and tied it around Elsa's waist. She had a devious plan. She pulled the rope down, and pulled it in her crotch, and tied it to her wrists. Elsa gasped, "Anna, why did you do this?" "Well, you said that you wanted to be tied up again when you had your birthday." Elsa then realized, "You made that bet just for this, didn't you?" "Yes indeed," said Anna. Anna then pulled something from a bag. It was a red rubber ball, with a strap on it and buckle. "This is something they made called a ball gag. Now, open wide." Elsa opened, and Anna put the ball between her sister's teeth. Anna was careful not to get Elsa's hair in the way of strap. She buckled it in, and Elsa moaned. Anna then booped Elsa's nose. "Mmmmph," said Elsa, rolling her eyes.
Anna then grabbed some more rope, and tied Elsa's legs together. She tied them at the thighs, above and below the knees, a single strand on her lower legs, and finally her ankles. Anna then held Elsa's arms, and said, "Now, to get you to the bed. Hop!" Elsa complied, and Anna guided her to the bed. Elsa sat down, and Anna rolled her sister on her stomach. She then climbed on, and said, "Now, for these cute feet." Anna then grabbed her legs, and tied Elsa's feet together. Anna then made a loop with some extra rope around Elsa's harness. She then pulled the long loose end back, pulling her legs back. She pulled the loose end connected to her feet to the loop, and pulled back hard. "MMMM! PHAT HURPH AMMAH!" moaned Elsa, as her back arched. "Sorry," said Anna with a smirk, "but think of this as a sister 'bonding' time." Anna laughed, while Elsa groaned into her gag. Anna then grabbed some string, and tied Elsa's big toes together, and then tied them to her hair. Elsa looked back, and saw her hair was pulled back and tied to her toes. Anna looked at Elsa, and smiled, "Now it's complete!" Elsa's mouth was drooling a bit. Anna quickly cleaned that up, and laid Elsa on her side. She covered her all except her head with a blanket, and climbed in with her. "Good night sis. Sleep tight!" Anna then blew out the candle, and cuddled Elsa. Elsa then closed her eyes, and promptly went to sleep as well. It wasn't easy, but she soon got comfortable.