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To Be Continued...
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It was good, right up until you had the brother forcing his sister to clean up the floor tiles with her toothbrush. Cleaning up his cum off of the sink and countertop alone would have been nasty enough, but the floor was disgusting and could potentially lead to a life-threatening illness that could take her away from him permanently. You went too far. 1/5
Almost believable. The boy should be careful to not get hurt by his sister's nipples, though. After all, they're 'sharper than nails.'
Every brother should be able to have unlimited sex with his sister(s). I know that I fucked my sister hundreds of times. She lived with me while she attended college. Mom & dad visited a few times and mom asked why sis' stuff was in my bathroom. I'd tell her that sis had more room in my bathroom. The next year when sis said that she was pregnant, dad wanted to meet the asshole that "raped his princess." Mom gave us that "I know" look, but didn't say it out loud. Sis & I pretended to be married when our daughter was born so my name was on the birth certificate. Mom saw the resemblances immediately, but still kept quiet. Dad passed away 5 yrs later not knowing that I'd fathered both of his granddaughters. Both of them know me as their dad, and I give them about anything they ask for (within reason of course). They promised to never tell their mother that I gave them sex lessons!