This is the second time you've snuck gas powder into your sisters drinks. The last time she caught you jacking off to her while she was napping. She was farting so much. This time, she wants to talk to you about what happened but she can't finish the conversation because she has to fart. Finally, you tell her the truth. She is mad and confused. She never knew someone could be turned on by burps and farts. She doesn't want to ruin her relationship with her step-brother so she lets you jack off and cum on her stinky farting asshole.

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