Cindi made sure he didn't let up

"You know I've changed my mind," Cindi said. "Get up, Pam."

Pam stood and reached for her top.

"I didn't say you could put that back on. Now Matt, sit down on my desk chair."

He did what she'd asked.

"Pam, lay down across his lap, ass up. And Matt, when she get there, flip up her skirt. Let's see what that slut has on underneath it."

Cindi was getting into the dom role. Which was kind of sexy as long as she didn't try it on him.

Pam followed instructions wordlessly, and Matt flipped up her skirt.

Underneath was a tiny thong, her ass-cheeks completely naked. And damn. She had a nice ass.

"You think she has a nice ass, don't you?"

"Uh, yeah. She does have a nice ass."

"Well take a look at this." Cindi pulled off her shorts proving that she wasn't wearing underwear at all. Her pussy looked freshly shaven and her ass, as promised, was every bit as nice as Pam's.

"Wow."

She bent over in front of him and pulled her cheeks apart exposing her pussy and asshole. "I was going to let you fuck it tonight because, you know, it takes a week for the birth control pills to work but now I'm rethinking. You should be punished for not asking me before you took Pam out."

"Come over here," he said.

Cindi's attempt at dominance shattered. "Okay."

She stood next to him, her pussy inches from her sister. "Now I understand you're a little upset," he said. "This isn't going exactly the way you planned but you haven't thought things through. It's going to be better than anything you imagined. You wanted to be the perfect girlfriend but guys imagine having their asses licked at the same time as their cocks are being sucked. Could you do that alone? They want to switch from pussy to pussy with every thrust. You can't do that alone. They want to eat pussy and fuck pussy at the same time. Again, you can't do that alone. Your sister is going to help you become the perfect girlfriend for me. Which is what you want, right?"

She nodded silently.

"Okay, now lay across your sister. I'm going to give you ten spanks for being naughty and then I'm going to give your sister that serious spanking you asked for. Are you okay with that?"

She grinned then nodded again. "Spank me, daddy."

Having two girls lying across his lap was more than a little awkward. Neither had especially big butts but still, even skinny butts added to some height when they were piled on top of each other. Still, he managed.

He adjusted himself, then rained ten spanks on Cindi's cute ass... three on each cheek, then four across both cheeks.

Her ass was red and so were her cheeks when she got off. "Oooh, that was... stimulating."

"And now Pam," he said.

"I'm ready," Pam promised.