Punishment
This happens immediately after the events of "The Bet". You didn't think that Claire would just let Amber get away with that, did you?
Claire continued laying in her sister's bed as Amber rose and left the room to have her shower. The taste of her sister was still hot on her lips as she panted. For the first time since she'd started making these bets with her sister, she didn't dread the thought of losing.
After a moment to reflect on what she'd just done, she lifted herself out of bed. In the minutes that had passed, a dark wet patch had formed beneath her rump. Grinning to herself, she lifted her used diaper and bunched it up, placing it in the wastebin by their door.
She pulled the doors to the closet open to gather the clothes she would wear on that day. A string swung idly from the breeze. Claire grabbed it and pulled; illuminating the whole closet. She was about to take a step, but noticed something odd on the floor.
It was a balled up DryFur diaper. Her eyes widened as she lifted the diaper up. It was heavier than normal and bloated with kitty pee. She could tell by looking at it that it was recent; they'd only just changed brand three days ago. She unfolded the pants and touched the wet padding. It wasn't warm, but it couldn't have been more than a few hours old.
She checked the sides and smiled when she found that they were unripped. The padding was only a very pale yellow; Amber mustn't have wet herself much that night. That wouldn't matter after Claire was finished with it, however. She sat it back on the floor and stood over it; one paw on either side. Knowing that her sister would be back any minute, she squatted over the diaper and let herself go.
Holding her towel fast around her body, Amber pushed her bedroom door open and dropped the towel. A peculiar sound resonated through the seemingly empty room. She turned to the closet to find Claire above the diaper she'd left in the closet. A golden stream flowed from Claire's still swollen pussy into the diaper.
Claire made it clear that she'd noticed her sister, but said nothing. Amber's mouth dropped as she struggled to articulate her thoughts into words. "I can explain." Claire shook her head. Finally the stream ended and Claire stood, taking the diaper in her paw.
"No need." Claire said sternly. "But you forgot this." She extended her paw.
Amber smiled nervously. "Put it back on." Her smile faded and a look of horror struck her eyes. Amber resisted silently for a moment, but eventually nodded in defeat. She took the diaper off her sister and slid it back up her legs. She closed her eyes as she anticipated the wetness touching her freshly cleaned pussy.
She shivered as the hot, wet surface pressed tightly against her girlhood. She let go of the DryFur pants and they sat securely at the top of her thin legs. "Please, Claire. This is embarrassing,"
"You owe me a win, Amber."
Amber's eyes stared at the dark floor as her mind raced for an excuse. Her blush burned her skin as she accepted defeat. She looked up at her sister, who stood firmly beside her bed, pointing down at her vagina.
Amber meekly lowered herself to the level of her sister's cunny and ran her tongue along her puffy lips. Claire spread her legs apart and let her sister get in for a deeper examination of her girlhood.
As much as she loved the feeling of her tongue at her opening, it wasn't until it hit the top of her pussy that she really felt the sensation that kept her coming back to this scenario in her mind. The feline tongue sliding across her wet hole sent shivers up her spine. "Oh, Amber." she moaned out for her sister. "Higher..." she demanded as her sister's mouth drifted further south than she liked.
Claire felt herself rocking against her sister's mouth. Her oral ministrations sent her into a world of bliss. She pulled away and stepped back, sitting on the bed. Her fingers gestured her diapered twin over. From this angle, Amber had better access to the hot lips and Claire could lie back and take in all of the sensations.
Her sister's tongue went back to work and it felt like she'd never stopped. The fire in her loins burst back into the forefront of her mind as her sister's tongue explored her labia and pleasured her clit.
She gently rocked her hips back and forth; shuddering at every tongue-stroke. "Right there!" She said sharply as her sister came to kiss her clitoris. "Keep kissing..." she moaned as her breath quickened. Each kiss had a sloppy lack of technique and each one was followed immediately by a lick along her girlhood.
The oral ministrations of her slightly older twin had reminded her why she'd wanted to win the bet so many times. Despite not really knowing what she was doing, Amber was damn good with her mouth.
She put her paw on her sister's head as she labored her tongue on her slit. "Use your finger." She commanded softly, between pants and moans. She sucked a mouthful of air as Amber pulled her mouth away and guided her finger easily inside her wet love hole.
Amber slowly pushed her finger in and withdrew it; licking around her opening as she pleasured her sister. Her sister had intended this to be a punishment but, even with the wet padding clinging to her waist, she enjoyed every moment of it.
Heat radiated off her sister's moist organ as she did her best leave no part of its face un-licked. Amber wasn't sure, but Claire seemed wetter than usual. Ordinarily, she'd have finished up by now, but this time seemed different. The things she said, the way her body pulsed, the rolling of the hips; it was all different. She didn't really know how to use her finger like this, she only knew the way it felt when it happened to her.
Claire's paws moved from her sister's head to the sheets; her fingers curling around the messy sheets. Each time she rocked her hips up into her twin's mouth, she pulled at the sheets a little. She felt the finger leave her pussy and both of her lover's paws grabbed her waist.
She dug in with her mouth; kissing deeply at her clit and giving the enter mound a good tongue thrashing. She heard Claire moan and then let out an odd sound more akin to a squeak than anything else.
"I'm almost there, Amber." She huffed. "Stick your finger back in." Without lifting her mouth off the sensitive clit, she brought her paw back around and pressed it to her tight hole. Claire's eyes opened wide and she sharply drew a breath at the penetration.
Amber licked further down, curiously licking over the opening to her pussy without feeling the obstruction of any finger. She pulled her head back and noticed where her finger really was. Blushing with embarrassment, she apologised to her sister. "No," Claire whispered to her. "Leave it in."
She had never thought about incorporating her tailhole into her play. Now with Amber's finger forcing her other hole open, she decided that it was as good a time as any to start. Her finger was slower with its rhythm, but her tongue compensated for it. "Keep licking there." Claire moaned as her breaths sped up.
She cried out loudly as she was overcome with pleasure. Of all the times her twin had gone down on her, none were as long or as satisfying as that. Her paws balled up into fistfuls of sheet and her entire body tensed at once; holding her waist up in Amber's mouth.
With a sudden rush, her juvenile fluid squirted a couple of little shots into the awaiting maw. The strong muscles of her tight butthole squeezed down on Amber's finger hard enough to stop her pulling it out immediately.
After a minute of the high Claire felt, she dropped, her body limp and drained. "Amber..." she panted as her sister joined her on the bed, lying close to the panting body. "That was incredible." She moved her arm over to lay a paw on her sister's wet padded behind. "You can take this off now, if you like."
Amber shook her head. "I like it." She climbed onto her sister's waist. Leaning down to stare her sister in the eyes. "And I love you." She kissed her dazed twin on the lips, her eyes closing as she just enjoyed their connection.
As their kiss broke, Claire smiled at her. "I'll tell you what, I'll let you win next time."