Stepdaughter caught me cheating....

Stepdaughter caught me cheating and blackmailed me with sex! I had a hot date with a horny guy outdoors at a swimming lake. We were sunbathing nude and were about to get dirty. It didn't matter to us that we had a lot of cougars! Suddenly my stepdaughter stood in front of us and asked me what I was doing! Totally embarrassed, I admitted that I was cheating and asked her not to tell Daddy. Then she said quite brazenly that she wanted something in return and she looked at the big cock of my date. I then offered her the chance to have fun with him if she didn't tell my husband, her dad. My stepdaughter didn't need to be told twice. First she sucked his cock deep until it was hard. Then she let him fuck her doggystyle in front of everyone. Until he squirted his cum into her mouth and she greedily swallowed it all! Then she left us and said she wouldn't tell us anything!