This was a while back, but for my sis 18 bday i had a plan to flash her since was being a lil slut with all my friends behind my back. She forgot about the old day... thats a conversation for somewhere more secure to talk about that. Anyways I came home a lil b4 her so I could set up for my plan. Her bedroom was across the bathroom door, so i went in to shower until she got home. Before she walked in I shut the water off and quietly got out the tub so she wouldnt suspect anything. I waited to hear her walk in and open her room door, and i knew she would start to change and in the middle of that i slowly cracked open the bathroom door so you could see me stroking my oiles up dick nice and slow while i was looking at stepsis porn. I made sure the girl looked like her and had it on my tablet with headphones in to pretend i didn't hear her. I know she watched me for a minute before she made a loud noise to pretend she just got home. Little did she know i heard her say dayumnn and moan a little as she touched herself.