Stepsis Cum Challenge

I can't believe I gave my step-bro a boner! I wanted to get going to the pool party, but of course my step-bro was still in bed. When I finally got him to stand up, I couldn't help but notice his cock looked like it was hard... If me just jumping on his bed was enough to make him hard, I bet just the sight of my tits would make him INSTANTLY cum. I can't have my step-bro creating a biohazard at the pool party!