It's Carla's sister

"Little sis?" You hear from outside the door. "Are you home?"

"Shit!" Carla says. "I forgot that she was supposed to visit this weekend. I thought it was next weekend, fuck! And I really wanted you all to myself."

You didn't like the sound of that. All to herself? She pulls out of you and you feel suddenly empty.

"Get your clothes back on, now!" Carla yelled as she got dressed herself.

You heard footsteps getting louder as Carla's sister was approaching the door. You frantically dressed yourself, ignoring the cum leaking from your asshole. The doorknob turns and Carla's sister opens the door looking for her. You are about to pull your pants off when you see her. She is like a 21 year old version of Carla. A few inches taller and very muscular. She is wearing a black tank top and short jeans that really reveal her toned body.

"Sandy!" A fully dressed Carla exclaims as she gives her a big hug.

Sandy then lays her eyes on you, still in the middle of pulling your pants on. You can tell that she knows. She cracks a big smile.

"And who's this cutie?" Sandy asks.

Before you can answer, Carla does.

"This is my friend, Doug," Carla says. "We were studying for a big test."

"Sure you were," Sandy says as she approaches you. "Hi, I'm Sandy, Carla's big sis."

"Sandy is on the wrestling team in college," Carla says. "She taught me all I know about wrestling."

"So what were you two really doing?" Sandy asks.

"I told you, we were studying," Carla says.

"Be honest, Carla!" Sandy yells. "If you lie again, I'll spank you. You know I still can."

Carla hangs her head. You knew that she wanted the two of you alone and now she couldn't.

"I was fucking him," Carla said. "He's my new personal toy."

Sandy looked a little shocked and then hugged her sister.

"I've never been more proud of you," she said. You were a bit taken off guard by that.

"You know, I had a slut back in high school that would always give up his ass to me," Sandy continued. "I was always afraid that you would never get one yourself."

Carla smiled at what her sister said.

"I have my own boy toy back at college but I left him there," Sandy said. "I'm so fucking horny right now."

"I can share if you want," Carla said.

You feel your stomach drop after hearing that.

"That would be awesome," Sandy said. "But my girlfriends are waiting for me in the car. We were supposed to go eat and go to the club."

Sandy pondered it while Carla took you by the hand.

"You thought I was big," she whispered into your ear. "Wait till you see Sandy."

"I've made a decision," Sandy said.