I'm home from college for the summer. My how you've grown, sis, in the year I've been away. 18 now, and your body is filling out nicely. Late at night, I sit at the computer in the den, browsing through Literotica. I pull up a something by asian_princess, and feel my cock growing in my pants while I read the hot story. My cock has grown too big for my jeans, so I slowly and quietly unzip them. I don't want to wake my parents or little sister. Slipping my hand in my boxers, I gently rub my balls. The text on the screen is so hot. My cock stiffens a bit more, popping out of my boxers. I grip it in my palm and slowly start stroking it.
Something feels different tonight, like I'm being watched. I look up from the monitor, and see you in the mirror, watching me from the hallway. My little sister come to see what her big brother does on the computer late at night. Standing there in just a long T-shirt and panties. I jump a little, but don't stop stroking my cock. You want to know what I'm doing Sis? I'll give you a show.
I slip my pants and boxers down to my ankles, and turn slightly, giving you a better view of my hard cock. I see you jump back a little, afraid I'll see you. I do see you Sis, and I love it. Watch your big brother stroke his cock. My hand moving slowly up and down the shaft. You reach up to caress your breasts. Mmm yes, this turns you on too. I have to restrain myself from staring at you too closely in the mirror, afraid you'll notice me watching you and cower back to your room. I don't want you to go Sis. I want you to watch me cum.
I wonder if you know about me listening to you masturbate. Out in the hallway, my ear to your door, jerking off while I listen to you moan. It turns me on so much, listening to my little sister finger her cunt. It's so wrong, but it turns me on so much.
