Pipp and Zipp Do a Lewd at School

"You usually get to cum first when we do this." Zipp opened her backpack and, to Pipp's shock, pulled out her favorite toy: a strap-on with a well-endowed white attachment. "So here's your chance to change things up, if you want."

Pipp took a moment to process what Zipp was saying and all but pounced at the opportunity. She got off the stool, her shirt falling back down over her torso as she came forward and took the toy from her sister.

Zipp moved her hands to her waist to start shimmying out of her panties, but Pipp held up a finger. "Ah-ah, not quite yet, Zipp," she said. "There's one thing we need to do first."

"And what might that be?"

"Get on your knees and you'll find out," Pipp said, pointing at the floor. Zipp's face changed to something just short of a scowl, but she sank back down to her knees anyway.

As Zipp looked on, Pipp put on the toy, pulling it up her legs until the straps were around her hips and the attached dildo poked out from beneath her skirt. When she was satisfied, Pipp stepped forward, leveling the end of the intimidating dildo with Zipp's face.

Zipp found herself in an entirely new position, staring down the barrel of a cock she rarely even let inside her pussy. "C'mon, Zipp, open wide," her sister said, pushing her hips forward and touching the tip of the dildo to her nose. "Say 'ah'!"

With one last petulant glare, Zipp opened her mouth. Pipp moved forward, pushing the dildo past her sister's lips and over her tongue. She continued in until about half of the dildo had disappeared into her sister's mouth before pulling out. In and out she went a few times, listening to the sucking noises and small vocalizations her sister made on the rubber. If Pipp hadn't known any better, she might have guessed Zipp was enjoying it a bit more than she was letting on. Finally, when the shaft was shining with a coat of Zipp's saliva, Pipp pulled out of her mouth entirely.

"Alright, it's wet now," Zipp said, pouting in indignation as she clenched her hands around her knees. "Can we finally—MGPH!" Pipp interrupted her by grabbing hold of her hair and stuffing as much of the newly-wettened dildo as she could back into her. Zipp tried to close off the back of her mouth with her tongue, but it was no use. The flexible rubber of the dildo surged past her tongue, made the downward turn and sank into her throat.

"This is for teasing me like that!" Pipp said as she kept the dildo in her sister's throat, using one hand on the back of Zipp's head and the other in her hair to hold her in place as she savored her choking and sputtering. Tears of strain appeared in the corners of Zipp's eyes as Pipp wiggled her hips around to grind the dildo against the walls of Zipp's throat, and no small amount of spit leaked from the seal of her lips around the thick rubber shaft.

With a tug on the back of Zipp's hair, Pipp finally pulled the rubber length out of her sister's throat. Zipp immediately bent over and threw herself into a desperate coughing fit, trying to suck in air amidst frenzied panting and coughing as threads of spit dangled from her lips. "H-foly fuck!" Zipp managed to get out as her breath returned to her. "What in Tartarus was that fo—MMMPH!" Pipp grabbed Zipp's hair, pulled Zipp up again and shoved herself back into her sister's mouth, burying the dildo all the way to the base.

After that, it was off to the races. With a tight grip on the sides of her sister's head, Pipp threw her hips back and forth with wild abandon, mashing Zipp's face into her crotch every time she shoved the dildo deep into her throat. The noises coming from Zipp only served to heighten her arousal, spurring the surprise facefuck on to greater speeds.

Zipp's eyes had never been more bugged out. More strained tears ran down her face, adding to the strings of slobber pouring out of her mouth while ungodly noises escaped her throat as it was repeatedly stuffed with rubber cock. Unable to escape Pipp's surprising strength, all Zipp could do was keep a tight grip on her sister's hips, take short breaths through her nose whenever she could and try in vain to relax her throat. "GKK! NGK! GLRK! GLKK!" she sputtered out as her sister continued to savagely rail her mouth.

Eventually, Pipp began to get tired, her thrusts coming not quite as hard or fast, though every last one still managed to push its way into Zipp's abused throat. Soon, Pipp's grip on Zipp's head slackened, giving her an opportunity to push away. The dildo left her mouth for the last time, freeing her up to start another distressed, convulsing and teary-eyed fit of coughing and spluttering. She brought one of her hands up to massage her neck as the soreness in her throat grew.

Pipp kneeled down beside her sister, the dildo still sticking out of her lap. "I'm really sorry, Zipp," she said, an embarrassed blush settling on her already-pink features. "I-I don't know what came over me." Zipp gave a small nod, wiping the tears and spit off her face and giving the occasional cough. Pipp wrapped Zipp in a gentle hug, feeling her sister's chest rising and falling against her own as Zipp's breathing returned to normal. "Do you want to stop?" Pipp asked, her voice barely above a whisper.

Zipp gave a long sigh before straightening up and looking at her sister. "Not a chance, Sis," she said before shrugging off the embrace and getting shakily to her feet. Pipp looked up at her sister, surprised at how quickly she was recovering from the near-violent throatfucking she'd just taken. "If you don't do my pussy as hard as that, I'm keeping your bra as well as your panties!"

Pipp just shook her head and smiled, both grateful she hadn't hurt her sister too much and glad they could continue their fun. "You just might have earned my bra anyway, Zipp."