In the bedroom
My wife recently had a car accident and broke her leg in multiple places. She's laid up on the couch and needles to say I'm getting no sex. My 30 year old stepdaughter is living with us, so just the three of us in the house. The other night I decided I needed to masturbate and figured I could do it while laying in the bed before I went to sleep. My wife can't get around so no worries getting caught by her, and my stepdaughter never comes in my room. Even if she wanted to wake me, she normally stands outside the door and yells for me. So no worries getting caught by her. So I pull down my shorts and start stroking myself. I'm laid out on the bed with no coverage and no worries when all of a sudden my stepdaughter comes in the door. I about fucking died as my stepdaughter said "oh my god" and backed out of the room closing the door behind her. She immediately went and told my wife that I was masterbating on the bed. To which I asked her why she didn't knock. Then i told my wife that i have needs. In the end my stepdaughter went to her room while my wife finished me off with a blowjob.
And no, I didn't fuck my stepdaughter. This story is actually real, unlike most the made up bullshit stories on here.