I could use some advice... I live with my amazingly hot fiance who is 43 and her two teenage daughters. As a 39 yr old man it's difficult for me to not check out the firm bodies of our 19 and 14 yr olds. My delimma is that I have a secret I want to share with my fiance but am afraid she will freak out. Sexual tension runs wild in our house. The 19yr old has a body that can stop traffic and she has been open to both male and female lovers in her sexual conquests. The 14yr old can't wait to talk about how good her ass looks in her yoga pants or question us about all things sexual. My fiance brushes it off as no big deal, but if I try to mention anything sexual about the girls she gets weird on me. So now that you have a bit of the backstory, here goes the good stuff.

I had announced that I was laying down for a quick afternoon nap before work. I had the bedroom door closed and both girls were home at the time. I slept solid for about an hour and when I woke up I had a raging hard on. I shed my boxers and laid out on the bed. I fired up my computer to a video chat site and was stroking myself to anyone who wanted to see. I had a rather young girl watching me intently on the computer. I was getting close to release as she flashed me her firm tits. That's when the door flung open! No knock or anything. I immediately looked up to see the 19yr old. She pulled the door half closed and said sorry. I closed the laptop some and had nothing to cover up with. I grabbed my boxers off the floor and slipped them on. There was a lot of ackward silence. I asked her what she needed and she said she wanted to borrow her moms dress. I said okay and she came in. I am sitting shirtless on the bed with boxers that do nothing to hide my erection. She walked in quickly wearing nothing but skin tight yoga shorts and a loose t-shirt with no bra. Her hard nipples gave that away. I mustered up the courage to broach the subject. I told her she caught me "rubbing one out". Here reply floored me. She laughed and said "oh, it's okay. I don't mind."
My dim witted brain coupled with my arousal took this as an opportunity. I stripped off my boxers while she was rummaging through the closet off the bathroom. I sat atop the bed and began to stroke my rock hard cock. When she rounded the corner of the bathroom door aha he just stopped and took in the site of me slowly stroking myself. She gave me a devilish smile then slowly walked to the bedroom door. She turned before she left, smiled again and closed the door behind her. She didnt make it five feet down the hall before I erupted in a powerful orgasm.
Guilt immediately overcame me and I jumped up to clean my stomach, chest and arm. When I made myself decent I went down to find her and apologize for exposing myself as I did. When I got to her room she wasn't there and I soon heard water running in her bathroom. I went to the door and wanted to say something but didn't know what to say. I knocked on the door and she said she was naked and getting ready to jump in the shower. This did let for me a I pictured her naked. She cracked open the door and I could tell she was anxious, but not mad. I apologized for my blatant exposure. She just smiled and said it was all good.

I am torn if I should share with my fiance that her daughter burst in on me masturbating. I am sure the truth will come out and it will probably come from the 14yr old. Just wondering if I should get my version out first before my shit hits the curb unexpectantly????????