Kelly finished your chores.

"Kelly!" Mom was off you like a cat in water, practically flying to her feet. She straightened her hair, eyes a little too wide to make her disarming smile convincing. You take the reigns, coughing embarrassedly as you stand, "Mom and I were just watching a couple mo-"

"Don't care. I did your chores, now can you help me? Please?" Distracted as you were, you hadn't noticed the manic gleam had returned to Kelly's eyes and she bounced with nervous energy. You glance at the clock irritatedly, "Guess it's been a couple hours..." Kelly grabs your hand and hauls you after her. You glance back at your mother, who looks more than happy to see you both go, slumping back into a chair and rubbing her temples.

"Goddammit Kelly! I was in the middle of some-Woah!" Your sister doesn't even make it to her room, shoving you up against the wall and pressing herself up to you, eyes wild with something close to lust.

"Omigod bro please, I've been waiting so long... I did all your chores better than you normally do, I even made your bed!" Her hands gripped fistfuls of your shirt, "Last night was amazing for me, wasn't it great for you too?" You find yourself quirking a smile in spite of yourself, delighting in her dependence on you. But you think now might not be the best time, at the very least you'll have to make your mother ignorant of the noise. You reach for Kelly's tits, fondling in mind, but she grabs your hands.

You look at her quizzically. She bites her lip and shivers, "John, please don't. When you touch me... it makes me able to control myself but it doesn't stop the wanting... the need... to have you inside me." She bites her lip, smoldering up at you through half lidded eyes, "Even if you touched me, I'd still want it, and then I wouldn't have the excuse. So... please..." She sunk to her knees, licking her lips longingly but keeping her eyes locked with yours, "Fuck my ass?"