Stepbrother outfit question escalates

I was getting ready because I wanted to go out with the girls, but was at a loss as to what to wear. So why not show my stepbrother what I could wear and ask him for advice, somehow it all got a bit out of hand and escalated. That shouldnt have happened. I hope he keeps his mouth shut and doesnt tell anyone about our little fling. How would you have reacted if you were him?