My name is Billy Webb; I'm 15 years old; my sister, Cissy, is 13, and pretty bratty. One night, I was in my room, jacking off-which wasn't unusual for me. I'm a perpetually horny teenager with raging hormones. Anyway, I digress. As I was jacking off, I must have been moaning a little too loudly, as my bedroom door opened, and there stood Cissy. "Are you...", Cissy started, then stopped.

"Jesus Christ, Cissy", I said. "Do I walk in on you when your bedroom door is closed?" "No", she said, "But I heard you moaning, and thought you were sick or something. But I see you're just, um, jacking off." "Get in here, and close the door; do you want Mom or Dad catching me doing this or you watching?" I asked her. She snickered, and came in, closing the door behind her. "Don't worry about them catching us", she said. "Mom said they were going to a party and wouldn't be home till late."

"So, what's it like, jacking off I mean?" she asked. "Well, it gives me a good ... wait a minute; are you telling me you've never fingered yourself?" I asked her. "I didn't say that", she said. "I asked what it felt like jacking off." "Oh, so you HAVE fingered yourself?" I asked. "She blushed so prettily, and smiled-something I rarely saw her do in my presence. "Let me see", I told her. "See what?" she asked. "You fingering yourself", I said. "NO!" she said. "That has nothing to do with this." "Well", I said, if you want to see what it feels like, jacking off, why don't you do it?" I asked her. "Do what?" she asked. "Jack me off." I said. "You're sick", she said. "You're the sick one, asking me that", I told her. "Come on; I won't hurt you."

She slowly walked toward the bed-something I hadn't counted on. I'd figured on her bolting for the door. "What would I have to do?" she asked. I was already naked, with a raging hard-on. I told her, "Just wrap your hand around my dick and stroke, up and down."

She tentatively took my rod in her hand, and felt it all over. She slid her hand up to the circumsized head, and giggled. "What's so damned funny?" I asked her. "The feeling", she said, "It's hard, yet kinda spongy." "That's the way the head is supposed to be", I told her. "Now, wrap your fingers around my dick, and stroke up and down. The skin'll stretch", I told her. Soon, she had a rhythm going, and was stroking my 7-inch cock like a little pro. Soon, I felt my orgasm coming on, so I grabbed my T-shirt, and laid it on my chest and abdomen. "Why did you do that?" she asked. "Because I'm going to cum soon, and I don't want it all over me." I said. "What's cum?" she asked. "My semen, the stuff that makes babies", I told her. As she took me into oblivion, I shot rope after rope of baby-makers all over the shirt. After the first rope, she stopped. "For Christ's sake", I told her, "Don't stop NOW!" So she kept right on going.

After I was done shooting, she said, "WAY COOL!" She looked at her hand, and realized she had some cum on it. "What do I do with this?" she asked. "Well", I said, "You can wipe it on my shirt, or you can lick it off", I said. "EWWW, GROSS!" she said. "Gross?" I asked. "Haven't you heard about girls giving their boyfriends a blow job?" "Yeah", she said sheepishly. "But most of the girls say they spit it out." "Some swallow it", I told her.

She gave me a "What the hell" look, and licked it off her hand. She tested, and tasted, it. "Not bad; a little salty, but not bad", she said. She took a dollop off my shirt, and licked it off, as well. Soon, she had my shirt fairly clean.

"Now you", I said. "What do you mean, 'Now you'?" I want to see you finger yourself", I told her softly. "NO WAY!" she said bluntly. "Come on, Cissy, who am I going to tell?" I said. "Well..." She said, and started to reach inside her robe. "Unh, Unh", I told her. "What now?" she asked. "Naked", I said. "WHAT?" she asked. "I was naked while you did me, now I want to see you naked," I told her. "Well...", she said. She untied the sash of her robe, and slowly slid it off her shoulders, holding it around her so I couldn't see anything. "Come on, Cissy", I said. She slowly opened her robe, revealing the finest young girl's body I'd seen. "God, Cissy", I told her, "You're gorgeous". "Yeah, right", she said. "No titties, no pussy hair, no nothing." I took her in my arms, and told her, "There's not a damned thing wrong with your breasts; they're beautiful". In reality, they were a nice mouthful each, snow white, capped by dark pink nipples and areolas. "You really think so?" she asked. "Yes, I do", I answered. "Well, I still don't have any hair down there", she said. "It'll happen in time", I told her.

She looked at me, and then down at the floor. "Since I jacked you off, do you want ... to ... you know, finger me?" she asked. "I'd be honored", I told her. She laid down, and spread her legs, giving me a view of her prize. I gave her a light kiss on the lips, and she moaned. I gave her another, a little more insistent, and she groaned louder. I pressed my tongue against her lips, parting them, hitting her teeth; she knew what I wanted, and opened her mouth. I slid my tongue into her mouth, tickling her tongue, and she responded by sticking her tongue into MY mouth. "You've done this before, haven't you?" I asked her. She grinned, and confessed that she'd tried it with a couple of her girlfriends, but not with a boy. "There's nothing wrong with experimenting", I told her.