With a bit of mischief in my heart, I hid under the bed to surprise my sister. Little did I know, I'd see things she never lets anyone see: changing clothes while naked, masturbating, having sex with her boyfriend. Thinking about the erotic stuff happening right above me made me so hard that I couldn't move! As I peeked, my sister caught me! I thought I'd get scolded, but seeing my erection, she got turned on too. Before I knew it, I was pushed onto the bed and we ended up having forbidden incestuous sex!
