Didn't go over well
My wife's sister stayed with us for 3 years (17,18,19) One night I came home late, Heard noises downstairs and went to investigate, I heard them coming from her room and the door was open just a crack. I peeked in and she was face down, Head buried in pillows furiously rubbing one out.
I opened the door and stepped into the room, Pulled out my phone, Video taped the whole thing as she got both hands going, Full rubbing, Lips spreading, One finger in, Other hand with one finger rubbing her pink little bum hole and then I videoed her as she begand to shake and moan, I watched as she got so wet she for real had it dripping, Her one had was dripping wet and she pulled her other hand away from her bum hole, I stood there as she twitched and jerked and came and then even got a couple little looks at her b**** which are way bigger than my wife's, She even teases my wife about the fact that she got all the b**** my wife missed out on.
She got up on all fours and I backed away to the door, I got video of her huge t*** hanging down and she stretched out as I backed out the door, I didn't have a chance to close the door and back down the hall into the storage room.
I put my phone away and hid in the darkness as I heard her make a little squeal and then I peeked through the crack between the door and the frame as she poked her head out the door and whispered "Hello?...WTF!!!...Hello?" and then closed the door, I VERY carefully sneaked to bed, Never made a sound and crawled in, I laid there awake and heard footsteps, She came to my door and looked in, I heard her whisper "April?...Mike?...WTF?" and walked away.
No one ever found out until a week ago, My wife found a memory stick i had hidden and it had the video on it....Needless to say she is not happy.