She doesn't like sharing

"I don't like sharing," Cindi said. "I wanted a boyfriend all to myself."

Matt opened his mouth to respond but Pam gestured him to quiet. "I know what I'm doing," she whispered before turning to her sister. "Please," Pam said. "I will owe you so much."

Cindi froze for a second. "How much?"

"How much do you want? I've got the ten thousand I got for graduation--"

Crap, that was serious money for sharing a boyfriend for a couple of months.

"Oh, not money." Cindi's smile wobbled for a moment, then got downright nasty. "I want you to get down on the ground, take off your top, then bend over and kiss my toe and tell me that I'm the senior girlfriend."

"Really? Take off my top? That's a little--"

"What? Are your tits good enough to share with my boyfriend but not good enough to--"

"Okay, I'll do it."

"Good. Now let me get my phone. I have to get a video of this."

"Cindi. If you share--"

"I'm not going to share it... unless you really do steal him. Then it's going to be on every social media any of your friends share. Now strip down and grovel."

Matt had to give her credit. Pam did what her sister ordered, stripping off her little sailor-suit top, then, as Cindi rolled video, got down on her knees, then sank to the ground, writhing like a snake as she approached her sister's feet. When she got there, she stuck out her tongue and licked Cindi's toes.

"Okay," Cindi said. "Matt, pull up her skirt and spank her ass. She's been a bad girl."

Matt didn't need to be asked twice. He could certainly get into spanking Pam... and Cindi. In fact, he had an idea that Cindi was earning some serious spanking right now.

"That wasn't part of the deal," Pam protested.

"You haven't promised I'd be senior girlfriend and you'd do whatever I wanted."

"I promise."

"Say it."

"You are senior girlfriend. I am junior. I am your servant, your ****. I will do what you want because you're sharing your boyfriend with me when you didn't have to."

"Perfect. Now spank her butt, Matt. Do it hard. If you only fake it, if her butt isn't so red she'll have trouble sitting on it while we're at dinner, you don't get to be boyfriends with either of us."

"He can still be my boyfriend," Pam protested.

"No he can't. Because I have this on video."

"Fuck. Okay Matt. Spank away."