Switching places

"You're so sexy, sis...!" Emma smiled as she broke away from the kiss, leaving a thin sheen of cum and saliva on her sister's lips. Then she grasped the girl's cute little face in both of her hands, and held her gently upright against the wall while smooching her again, before slowly standing herself up on her feet.

"There's something I've got to show you though..." She continued, while unclasping her skirt and letting the garment fall to the floor. "You're not alone, of having one of these...!"

"Ohmygod...?!" Hannah whispered at the sight, and her big eyes went wide in shock, as her sister's cock was fully exposed and pointed right to her face. "B-but how...?!"

"I have no idea!" Emma confessed, while admiring her sister's cute little face - with her jaw dropped low, like an open invitation... "It was there when I woke up this morning, just like yours!"

"I do know one thing, however..." She continued, in a hoarse whisper, while meeting Hannah's eyes and grasping with both hands around the back of her head. "You owe me one..."

"Mmmph...?!" Hannah gasped, and found herself staring down the length of that monstrous cock, while it slid home into her mouth. Her lips closed tight around it though, as if acting on pure instinct, and she was careful not to scratch it with her teeth - even as she didn't fully agree to the invasion.

"Oh, fuck!" Emma threw her head back and moaned in pleasure, while enjoying the sensation of her sister's soft lips and the warmth of her mouth on her shaft. Then she couldn't hold herself back any longer, and firmly started pumping her hips against the girl's little face. "Oh fuck, yeah!"

Hannah meawhile could do little but try and keep up, her hands grasping at her sister's thighs, and her tongue unwittingly exploring the thing in her mouth while she was merely trying to keep it out of the way.

While Hannah wasn't such an expert little cocksucker like her sister, her skills or even willingness wasn't much needed for Emma to get off to. With all the excitement, that she'd been building up this crazy morning, it was barely a minute before her cum started rising from the bottom of her heavy new sack. And then she literally exploded, deep inside of her sister's little mouth, and almost instantly filled the girl up with rope after rope of sticky hot semen.

"Ack...?!" The girl gasped and gagged at the sudden eruption, trying to pull away, but found her head held firmly in place while even more of the gooey substance kept blasting away at her tonsils. Soon it was spilling out from the corners of her lips, dribbling in thick gobs onto the front of her pink pajama top. And when the cock was finally withdrawn, it graced her sweet face with it's final burst, so that she was practically soaked with the stuff while she started coughing to keep it from running down her throat.

"Oh, wow...!" Emma just chuckled though, while watching her sister's cum-soaked face, and then making the mess even worse by wiping her slick shaft upon Hannah's cheeks. This usage of her sister as some kind of cum-dumpster was turning her on to no end, and she wasn't surprised in the slightest to find her cock remaining fully erect - even after such an impressive load like that.