Git Gud lil' sis

"I'm bad at sex?! What do you MEAAAAAAAAAAAAAAAAN!?" the shrill voice of a little sister howled out, shattering a nearby glass. Her Big Sister grimaced, holding paws over her ears. Big Sis wore fur of glimmering heart and flame of shining soul, little sis the reverse. "I mean what I mean." Big Sis grumbles out, reaching into her ears to pull the ringing bells out and throw them over her shoulder. "But she came so hard she's foaming at the mouth!" lil sis cried again, gesturing to an overstuffed and underbrained bimbo laying in a cum coma.

"My beautiful, darling little sister... I just pulled her brains out and replaced them with slutty nerve endings. She's going to cum so hard she's going to actually die when she tries to walk down some stairs." Big Sis shrugged at the pouting, sopping wet eyes of her little sis. Those sopping wet eyes eventually turned into little hiccups and sobs and paired waterfalls of tears that were starting to ruin the carpet, to say nothing of the flood of ringing bells falling out of Big Sister's ears from the wailing. "Stop crying! Big Sis is gonna teach you!"

The waterworks and cries stopped instantly, replaced by little sis hopping into the air and emitting tiny little excited barks, yips and even the occasional "Yippee!!" which continued in the background as Big Sis started throwing the water out of the window before it molded. Eventually the two found themselves in the bedroom, Big Sis laying spread eagle and little sis standing over her, knotted cock drooling pre all over the bed at the same rate that lil sis was drooling into her own cleavage at the sight. Big Sis curled her lips into a frown. "You're too little sister brained to understand normal instructions." she concluded, to which her little sister only responded with a "Guuuuuhhhh....??? Big sisssss..." and cumming violently, completing painting Big Sis in little sister cum.

Big Sis sighed, her conclusion even more concluded than ever before. She reached down and gripped her little sister's cock, plugging the tip with her thumb to keep it from cumming even more violently at the touch. Her flame gathering in that single point and then shooting into her little sister's cock, little sister's balls exploding to four times the size from that alone, and then another four times from the backed up cum. Little Sister blinked, an odd depth of thought possible even while looking at her Big Sister's naked body, which now lay limp. "There. I'll just show you manually." Big Sister's thoughts came from Little Sister's balls, and she slapped a fist into her palm. "Oh! You're in my cock and balls now, Big Sis! You're soooo smart!" she yipped, and then gasped as shining soul flames burnt around her crotch.

Her entire body was guided by her cock, paws forced to grip Big Sister's soulless flesh to keep it steady. Little Sister and Big Sister's empty flesh howled in unison as the cock slammed itself to the base of the knot in a single thrust. Little Sister tried to commit this to her memory but the capacity for her to form anything complex as that faded as the thrusting started. She didn't even know her hips could move like that, but she was rapidly forgetting absolutely everything, lost in the pleasure of her Big Sister's pussy.

Even without a Flame the flesh instinctively squeezed and milked with such instinctive technique that it would make a succubus ask someone that knew how to read and write to take notes for her, and then read them to her while she was nose deep in their pubes. Time ceased to exist as a concept that Little Sister could understand anymore, so she had no idea how long this had gone on, but the red circle and white circle outside the window had changed places at least, uh... Many times before her balls finally clenched.

The totality of creation compressed into a single instant, a single space, Little Sister's mouth wide open but too tense to even let a molecule of air out as she finally came, filling Big Sister up like she was already 9 months pregnant in the first rope and not stopping. Eventually shining soul colored flames ignited back to life around the morbidly pregnant flesh, Big Sister pulling herself back upright and stretching like she'd just taken a nice nap. "Aaah... that was at least a few thousand orgasms my flesh had. You understand now, lil sis?"

Little sister flopped forward into Big Sister's belly, which was rapidly deflating as she shunted all of the cum into a pocket womb dimension to be used as spare biomass for funny pranks. Eventually she looked up, entire body twitching and trembling, and opened her mouth. "Gguhhhhh... ddduuuhhhh... biggg... siisss... dehehehe... huhuhu..." she babbled out before her eyes rolled completely back and she settled for drooling and gurgling into Big Sister's fur. Big Sis just sighed with a smile on her face and pet her little sister's head. She also burnt the knowledge of how to fuck good into her smooth little sister brain and muscles, since she wasn't gonna waste her whole weekend on JUST fucking her flesh into paste. This is the difference between a Big and little sister.