Lbdabb/Tina/Tina's room/Loud/Let her finish/Keep watching

Louise bit her bottom lip and resisted the urge to give in. This wasn't a time to be like Tina, unable to keep her hands off herself. She had a job to do and even if it meant having a tingly cunny, she would see it through.

This also meant that Louise was free to watch Tina more closely.

Tina was still on her back, knees bent, and thighs spread as she finger fucked herself. She had her palm braced against her pubis, spread apart at the the middle and ring fingers, spreading her pussy lips apart. Her free hand was sliding into her cunt, delving deep as she rubbed herself. Louise noticed that Tina tended to focus her fingers upwards, towards her abdomen, like that was the spot she was aiming for. Soon Tina;s moans had evolved into near-silence as she edged closer to orgasm. Tina's entire body was squirming on the bed. Her toes were curled and she seemed to be shaking.

"Is this Tina's ritual every morning?" Louise wondered, "no wonder she's been late so much. It would also explain the smell."

Tina's hormonal lust scented the air in her room, and maybe even beyond. It was a tangy and sharp smell, though it wasn't necessarily bad.

"Jimmy Junior," Tina whispered one last time. Then her face froze, stuck in a mask that was half grimace and half pleasured scream. Her back arched and her body went rigid as Tina formed a bridge on her bed with her body. She raised her hips straight up, giving Louise an even better look. In the chaos as Tina came, Louise admired her sister's frozen body. The clit, no longer obscured by Tina's furious hand movements, was throbbing as she leaked clear juices. Louise wondered if Tina was peeing, but before she could be disgusted by it, she realized it was probably that thing some of the older girls at school were talking about; squirting.

That moment seemed to drag on before Tina resumed her normal breathing. Her body quickly went from frozen rigid to vibrating. Her muscles seemed to lose some control as she slowly regained herself. But Tina was still clearly in the throes of her orgasm, unable to to comprehend that not only her little sister was mere feet away, watching, but there were other problems that required her attention.

"Kids! I'm not asking again! We got a busy day!"

Linda's voice was furious. Louise knew that tone and knew that they had to get to the kitchen soon, lest they be grounded and lose their entire Saturday.

"Don't make me come lookin' for you!" Linda screamed from the kitchen.

Louise looked back at Tina. She had no idea. Her middle finger was still inside her pussy, moving with purpose along the slit and spreading some of those excess juices around. Then she plunged it deep, moaning the whole time. Tina didn't hear their mother at all. If Louise didn't act quick, they'd both be grounded.

• Answer back to mom, giving an excuse as to why you're so late. This will reveal yourself to Tina, though.
• Reveal yourself to Tina and help her get dressed through her post-orgasm haze.
• Sneak back out of the room and go to the kitchen with an excuse on Tina's behalf.