Senior Slump Part 6: Afterglow

Part 5 (https://www.reddit.com/r/BallbustingStories/comments/18y4m45/senior_slump_part_5_checking_in/)

The siblings sat there for several minutes, enjoying the afterglow. Then is suddenly occurred to Sam that they should probably have locked the door. He got up and did so, and turned back to Penny. She was giving him a sheepish grin, which he returned.

"Soooo... that happened." she said.

"Yeeeaah..."

"How... do we feel about that?"

"Honestly? I don't know." said Sam, sitting on the bed next to Penny again.

"You don't regret it, do you?"

"I- No. No, I don't. I don't know. I feel like I should, right? Like, I feel like this should feel wrong, but, I dunno. It doesn't. You know what I mean?"

Penny looked relieved at his words. She put a hand on his cheek.

"Yeah. I know exactly what you mean. It doesn't feel wrong at all." she drew closer, "It feels right. Good."

"Yeah." breathed Sam, "Good."

They're faces, still red and sweaty, were mere inches apart as they looked into each other's eyes.

"I really wanna kiss you, Sam." whispered Penny.

"Then do it, coward."

She chuckled.

"Shut up."

And before Sam could reply with a playful, "make me," she had kissed him, pressing her lips against his, revealing her inexperience. Noticing she was unsure, he began to guide her, gently coaxing open her mouth with his tongue and relaxing her into a pleasurable rhythm. And then they were making out, naked on his bed. She pushed him down onto his bed and mounted him, resting her dripping pussy against his semi erect cock as they kissed, small moans of pleasure occasionally escaping her. Eventually they broke apart, both still spent from their recent orgasms, and Penny rolled off to lie next to him. He turned over and spooned her, and began to casually play with her nipples. She giggled.

"I had no idea kissing would feel that good." she said.

"Was they your first time?"

"Pretty much. I mean, I've kissed people before, like on the cheek and stuff, but nothing like that."

"Is it weird that I'm glad I was your first kiss?"

She chuckled.

"Honestly, bro, I think we're a little past weird."

"Heh, true."

"...I'm glad, too."

"I love you, Penny."

"I love you to, Sam."

There was a moment of comfortable silence as they cuddled before Sam spoke again.

"We're pretty fucked up, aren't we?"

"Yeah. I don't care, though. Who gives a shit what anyone else thinks?"

"What about Mom?"

"Well... She doesn't have to know anything. There's plenty of stuff we don't tell her, right? We can just add this to the list."

"Yeah. Still. I never imagined I'd be doing this with you."

She turned around in his arms and looked at him, a grin on her face.

"Really? Neeeever?"

"Well, I mean. Maybe not never."

"Hehe, I knew it. I knew you thought about doing lewd things with your sister's sexy little body. What did you imagine, huh, bro? Did you think about fucking me? About me sucking your big, hard dick? Did you think about filling my pussy with up with your cum? Hmm?"

"Jesus christ, Penny. And you call me a pervert." Sam laughed.

"That's not a no." she trilled.

"And what about you, is that what you imagined? Me cumming inside you?"

"Maaaaybeeee."

"Be careful what you wish for Penny, it might just come-"

He was cut off by a rattling of the door, followed by a knock.

"Sam?" called his mother's voice, "Have you seen your sister?"

Penny shot him a panicked glance, her eyes wide, and shook her head.

"Shit!" he said under his breath, "Uh, no, mom. I've just been in my room."

"Okay, well if you see her, tell her her laundry is in the dryer, okay?"

"Okay!"

"Thanks, sweetie."

They waited to hear their mother's receding footsteps before daring to breathe again. They both sighed in relief.

"Fuck, that was close." whispered Penny.

"Yeah. Too close. Good thing I locked the door."

"No kidding. I don't know how we would have explained this one."

"We should probably get dressed."

"Yeah."

They dressed quickly, and then as soon as she was sure the coast was clear, Penny snuck out of his room, and darted across the hall to her own.

Sam collapsed back into his bed again and let out a big sigh. It had been a very long, and very strange day, and in that moment, a good night's sleep was the only thing on his mind. But first, dinner. He. Was. Starving.