So, let me just say getting caught actually kissing your sister is a serious and frightening thing, getting caught by your mother is absolutely terrifying.  It was a Thursday, one I can never forget, my sister and I had been home after school for probably close to an hour before she knocked on my door.  It took her several stammered attempts and a few minutes to finally blurt out the question, “Have you ever kissed a girl before?”

Surprised, shocked, stunned.  It took me a moment before I was able to lie, telling her I had kissed a half dozen girls and species compared the the two I had at least touched lips with.  Well I can say now that the question had been prompted by the fact she had her eleventh birthday sleepover the weekend after next, and after several minutes more of sort of explaining she asked for the unthinkable, could I teach her.  Baring all the wrongs, and all the other thoughts that roamed though my fifteen year old mind the biggest thing was the fact that I could get some practice and there wouldn't be any judgment on how bad I might be doing.  “You sure?”  I finally asked.

With her nod I waved towards the bed and we sat down.  Awkward, I'm not even sure that word comes close to an accurate description.  It took a few tries before I could get her to tilt correctly with me so that our muzzles lined up for a decent kiss and me tonging her for the first few moments while she sat dead.  It took time, god how I wish I realized how long we had spent practicing and talking about how to be better, but finally we were seriously making out.  She didn't even pull back when my hand wandered up her side and squeezed the small lumps on her chest.  We paused for a few breaths then with me encouraging her by saying how good she was becoming we dove in again, both our hands now as active as our tongues had become, mine wandering her body while hers had started at my thigh and slowly crept higher.  

“WHAT THE HELL ARE YOU TWO DOING!!!”  I can not truly state how scared I felt in that moment, had I not locked up tight after yanking myself away from my sister I probably would have shit my pants.  After yelling and screaming, calling my sister a slut and me names that I never believed I'd hear my mother utter, she calmed down a little and just stared at us.  However what she said next had both of us confused.  “Well if you're gonna do this you'd better do it right.”

We both sat there, still terrified as hell, and trying to figure out what that meant.  I for a moment I thought somehow my mother was actually going to step in and teach us herself.  “Get your clothes off both of you.” 

Now when my sister asked me earlier for lessons had left me in shock what mom had said mad no sense at all and both of us just sat there.  “Come on hurry up.”  She stated with a firmer voice.  Still not getting the response she wanted her voice changed to that dark mom tone, the one that is much quieter but left you with real fear.  “Get your clothes off or get out of my house.  If you two are gonna fuck around then you are going to do it right!”

I mean, what, what could I really do.  There was no way I was leaving the house and at the moment my mother looked like she actually was going to throw me out, even to the point of glaring at us both with a slight lip curl showing teeth.  It took me two tries to stand up, having sort of half flopped back to the bed half way up the first time, and I slowly went for my pants letting them drop. I have no clue what my ten year old sister thought but by the time my pants slid down she had stood up as well.  Now I began struggling to get out of the rest of my clothes, mainly with my shoes but more with my mind.  Did my mother actually want me to fuck my sister, or was some truly twisted punishment about to start.  Honestly I could imagine both at the moment but that changed with her next words.  “You're not on the pill right?”

“MOM!” My sister shouted.  I doubt she had ever thought of taking the pill, that was something you might do if you were actually planning on having lots of sex right.  Her shout however was more for that fact that I think both of us finally realized at that moment that this wasn't some punishment or joke. 

I know we both still had our underwear on when my mother stopped my sister long enough to get her full attention, “You are NOT allowed to take the pill while you live in my house.  I don't care if you two use a condom or something else but you are not allowed to take the pill.”  There it was again, that quiet chilling voice.  It changed back when she looked over us both again, “Stop stalling.  When was your last period?”  She shot the question out after we were both naked.

“Um, I don't know.  Maybe about two or three weeks ago.”  

I really doubt my sister knew enough about reproductive cycles and fertility peaks, I mean I only really knew because of how much they stressed it in health class this year but I think she was still on the 'this is a penis and this is where it goes' type of class, certainly not one that was preparing kids to help avoid pregnancy.

“Good.  Now on the bed both of you.”  I turned at looked to my sister watching her as she slowly climbed back up on my bed and sort of flopped down, probably never believing in her life that this was going to happen, I mean I never believed this could happen.

“Umm.  I don't have a condom.”  There, I said it.  God I was hard, nearly everything going through my mind was the fact I was about to have sex, with my sister, but still sex.

I made the mistake of looking at mom.  Pissed off beyond anything I had seen before would be the best way to describe it. “NOT NOW!”  She shouted.  In a slightly less loud voice she explained.  “You wanted to fuck around with your sister so now you're gonna fuck her, and you're going to do it right.”

I couldn't believe it as I crawled onto the bed and over my sister.  It was like my mother not only wanted me to have sex with my sister but she wanted me to knock her up as well.  We shuffled around a bit until I was between her legs and hovering over her sex with mine.  “Do I have to put it in for you?”  My mothers tone was snide and something that didn't really remember it later but it left me feeling that she would.   

With that I pushed myself inside.  I really didn't feel anything rip or tear and she only let our a slight sort of squeak.  I guess we were both still ready for this, I realized later that we must have spent close to two hours getting ourselves worked up.  I know I stared at her for less than a minute while I made several thrusts but there was no way my rock hard dick was going to give much before it blew.  The slap on my ass wasn't needed as I was already pushing as hard as I could,  “All the way up inside.”  My mother barked.

To say I let loose was fully accurate.  I pumped out as hard as I could pasting my little sisters vagina with as much spunk as I could, literally feeling waves shoot out each time I pressed hard against her.  I don't know what she felt but when I was done I gave her a firm kiss resting my body on top of her though she was just laying there as I panted and recovered.  

I felt movement but it wasn't until my mothers hands helped me to roll over, with my sisters leg hooked over my back keeping us connected, did I realize exactly what she was doing, and what it really meant.  She stared at both of us for several moments before she spoke.  “I don't care what you do, or what you decide to wear or not wear but while your in my house I expect you both to do it right once a month.”  I can only remember that she sounded both happy and satisfied when she told us of our punishment.  I don't know if my sister wanted to do anything like this again, but according to my mother this certainly wasn't going to be our last time.

The rest of the day was lost.  I was in a daze as soon as she had finished speaking those words and left my room closing the door behind her.  I have no idea how long it was before my sister finally started to pull away and I slipped out but I do remember mom had mentioned she had to wait at least ten minutes.  I do kinda remember that my mom still seemed pleased when we had dinner, both of us back to at least looking  like normal kids for the moment.  However, neither of us were prepared for what happened the next morning.  Mom woke us both up like normal but after our normal hurried breakfast she told both of us to go back to my room where we would discuss things.  

The discussion was simply to tell us we were not going to school and that she felt that we had not properly had sex since my sister didn't have an orgasm.  She expected us to do it right and that meant we had to do it again.  Her happy attitude was only marred once when she suddenly glared when we didn't start undressing.  She watched us make out for what must have been an hour this time we did it right, both kissing and groping.  I was all but leaking all over myself, and my sister hand, while she was actually starting to seem to enjoy herself and the squeezes I made on her small breast and rubs to her pussy.  My mother made several suggestions on what I should be doing during this time before making us stop.  She made me concentrate completely on my sister, sucking on her small breasts while fingering her frantically.  I guess she knew exactly what she was waiting for because she suddenly made me stop and told me I had to hurry and mount her, her exact words.  I slid back inside and before I had even really began my sister grabbed a hold of me and pulled me down, trying to crush me.  Her orgasm set me right off and mom's vocalization of putting it all the way inside was pointless.  I was fully ready to not just to seed but breed my little sister.

From there on it was a non stop sex show.  We did it all the time in just about every place, the only place my mother insisted we couldn't was at the table when we ate.  That and she was sure to raise both her voice and her threats when she found us in the same bed together the morning before school.  School nights we were expected to have our sleep, fun before bed was fine but sleep alone was necessary.   Though that didn't stop us, one time she was out we ate our dinner at the table me filling her up inside, and there were several morning were one of us dashed back to our rooms just minutes before she would have caught us together.  There were also those few time she chased us off to one of our rooms but I think she was still excited at watching us go at it.  Even with all that it didn't stop her from calling us together once a month making sure we 'did it right'.  Some times she even had certain conditions that she wanted us to do, like right before bed making sure my sisters was fully spunked before she was allowed to sleep with out being allowed to clean up after.

It took much longer than you might think, certainly longer than I thought it would.  Two years, just after her thirteenth birthday my sister finally missed her first period and even that didn't stop our near constant sex spree.  Then one month after she gave birth, a limit my mother emphatically in forced to the point of actually showing me a cage she had bought for me if she caught us, we were at it once again.  This time working on making a brother for our new baby daughter, after all if we were gonna do it, we were gonna do it right.