Incest is best

Just when Ben laid back, panting and going over what they just did in his mind, Janie shocked him.
"My turn!" She said as she licked off most of his cum.

Ben looked at her through new eyes. This little baby sister was growing up much faster than he imagined.
Janie sat upright, with a look in her eye as if she wanted to go on that roller-coaster ride again. She grasped her budding breasts feeling their ache, the longing for them to be touched. She leaned forward over Ben, still panting, sweat forming in beads on his chest. She let her breasts slide over him, caressing him, stroking him. Looking at him again she saw his smile, her heart melting, her inner self warming to him with every new moment.
This is what I've been missing out on she thought to herself.
Ben reached around her waist, hoisting her onto his hips. He could feel her wetness on his stomach.
"Oh my baby, do you need me to take care of you little one?"
She deliberately sucked on her thumb and twirled her hair through her other hand's fingers, acting even younger than she was.
Ben looked up her up and down, this vision of adult beauty wrapped up in a small package. Most would say she was far too early to pick, but he now knew it was sweeter that way. He felt himself getting aroused again, it wouldn't be long before he could yet again thrust into his sister, but for now, he had other ideas on how he could please her after he had used her as a fuck toy.
"Come closer Janie, sit on my face, your hole over my mouth. OK?"
Janie, satisfied he was going to please her now, did as he asked, shuffling her way up and over his chest, until her hairless cunt was dripping onto his chin.
He grabbed her ass, pushing her up, admiring the view before letting her back down onto his extended tongue. His muscle tensed in order to give her most pleasure. He licked Janie right from anus to clit, causing her to let out another moan, her hands grasping onto the top of his head, clutching two handfuls of hair. He kept his tongue taut, using it to move her juices out and over her delicate folds, every now and then diving into her depths.
He relaxed his tongue now, sending it quite flat over her young lips, so his tongue followed her curves. He then started circling her clit, which was by now rock hard and extended out of her little hood. Red and swollen from her desire to be taken again.
His hands still firmly holding her buttocks, he squeezed more tightly and parted them, spreading not only her cheeks but her lips apart too. She moved her hips forward for better access, wanting him to take her everywhere at once.
He probed at her anus again, her juices letting his tongue slide in and out with ease. With a little bit of coaxing, he inserted a finger and began to fuck her ass with one finger. Feeling her tense up around him made his cock wake up, he could almost feel the blood run into it and stay there. As he suckled on her clit, gently flicking it with his tongue when it was inside his mouth, his finger wiggling inside her, he felt his cock rest against his stomach.
Her juices were readily flowing around his chin now, her hips moving haphazardly on his face.
"Oh Jesus Ben, fuck meeee! Please Ben, fuck me now!"
He wasted no time in flipping her onto her back, kissing quickly up her stomach to settle on her breasts and pay them much needed attention. He felt his cock graze the sheets, sending a quick burst of pleasure flood through his body.
He paused.
"I love you Janie."
She smiled.
"Ditto bro."
And with that he once again rested his cock head against her small entrance, finding the right time to enter. Slowly, he inched himself into her, into his little sister, into that cunt with no hair and into that little tight pussy just dripping in wanton lust for him.
He nuzzled her neck and ears as she grabbed onto his back, pulling herself around him, extending her legs as far as they'd go around his waist. It was just as she felt herself lifting entirely off the bed that she felt Ben slide in the rest of the way, filling her up and making her complete.
Ben rocked forward, bringing Janie swinging back and forth onto and off his dick. Continuing this until his arms could not hold her, he sat up instructing her to turn around. It was this point that he thrust harshly into her ass, not taking the time to let her become used to the sensation. Letting out a scream, he reached forward and grabbed her mouth shut, he knew if he just stayed in she'd get used to him again. He knelt over her, throbbing cock pulsating within Janie's core as he groped her small chest, feeling her smooth skin.
He felt her moans subside and released his hand causing her to suddenly breathe in, having had her air restricted. He moved it down to her cunt where he began to fondle her, massaging her wetness into her skin. Inserting two fingers, then three into her cunt.
Oh yeah, that's what I need Janie flew her head back and let out a large moan, her tones sending more vibrations right through his cock.
He thrust his fingers into her cunt as eagerly as he fucked her ass. Pulling back on her shoulders with his one free hand he began to enter his steady rhythm.
Just when he thought he wasn't going to make it, he felt the walls of her passage tighten, grasping his cock in a mean strangle hold. As he inserted his cock that one last time, he felt her whole body shake, just as he felt his balls tighten and then explode into her ass. His juices mixing in with hers as it flowed down her ass cheeks, he made his way down to clean her up as best he could.

"Did my baby cum?" Ben whispered softly into Janie's bright red ear.
"YES! Oh, Ben," she lifted her head off the bed "please let's do this again?"
"You certainly have no worries there sister, I'll always be here for you. Right now though, we need a shower before mum and dad get back."