they won't

"Stop it now!" A voice cried from upstairs. Your sister runs downstairs. "How dare you! Your better than that! Your better than this curse!" Your parents ashamed of their actions begin to relent.

"Sorry sweetheart" you mother says as your sister grabs your hand and pulls you to your feet.

"We're going about this all wrong. The answer is so simply. The curse makes us hornier and hornier. But mom and dad can have sex they're married. me and John can't get eachother pregnant. So we just pair off for the weekend and pleasure one Another until the time is up." You blush at your sisters explanation realizing what it means. But no one can despute her logic. So you follow your sister to her room leaving your parents to themselves. The moment her door closes your ready for sex with your sister. But to your dismay she sits on her bed and begins studying again.

"Your welcome." She say offhandely. Horny and dejected you sigh, she is right after all she did save you and she dose need to study.

"Thank you" you say meekly before sitting down. You grow board soon, but what can you do this is the only safe room for you. Time passes and you fall asleep.

You awake to the feeling of your sister licking your pussy lips. Running her tongue over your clit you let out a long moan.

"You've been asleep for hours, and the curse has made me horny so let's get this done and out of the way already." She say casually. Continuing to eat you out as you cum you squirt all over her face. She lays back looks you in the eyes and says "get to work" you obey with great zeal stuffing your face in your sisters pink folds. She moans at your minstations and you run you fingers over her clit as you eat her out. You gently pinch her clit causing her to gasp as she come hard. You rise up to kiss her, but she stops you. "What do you think your doing? This is just a practical arrangement to get past the curse." She angerly says. She's right of course. And so time passes in between her studying you and her eating each other out and sleeping and before you know it 48 hours is up and your family is back to normal. Minus your now a lady killer brother. That aside normalcy returns.