Caught My Little StepSister Masturbating! Fucked Her to not tell our Parents!

My StepBrother came home earlier from work... I was talking on the phone with My boyfriend and we are having a little bit of phone sex because i hadn't seen him for a whole week! hihi! I couldn't let My Brother tell it to Our Parents!I would have been grounded for 2 weeks! I had to do everything i could to keep it a secret!!