I roleplay as your teenage step-sister. I'm wearing tight leggings, a see through top and cute cotton panties. I'm not aware that you're watching when I start masturbating, first using my fingers then a hairbrush. But I turn around a catch you staring! At first I'm surprised, and embarrassed... but then I start getting playful and teasing you! "So, big bro, you like staring at your lil' sis perky tits? What about my tight teen pussy?" I'm getting really turned on.. I carry on masturbating and cum for you, humping a pillow!