Doing biology practicals for my 10th sister

Hi readers of iss I am new infact iam introductry by this story its real,my name is Ivar I am 19 and my sister’s name is Diana i call her dinni, actually our house has five rooms one of them is study room the whole story begin’s here our family consists of four members father,mother,me and my sister dinni, she is so cute and emotions girl she reacts very fast to emotions our parents go to our relatives house two days in a month where they are in another city,that day my father received a call that my uncle was ill so our parents left to see them in another city,me and my sis dinni we are only at home,i actually see lot of movies in tv and i watch sex movies a lot more under the absence of my parents while my sis dinni goes out to her friends house,i do lot hand job thingwhen i think about my fantasies, one sudden day i was in mood of doing a handjob and i was thinking about my sister dinni we are at study room,i cant do in her presence so i said “dinni wait here and dont come to my room,stay here only “and went to my room.i removed my phant and my 6inches cock is throbbing and iam holding it i was forgot to lock the door i closed it but forgot to lock,i said “dinni read loud” so that i know where she is,i was holding my cock and moving to and fro by seeing my family album its dinni’s picture in that she was very cute and showing her cleavage very sexy i was moving my hand around my penis very fastly actually every time i do this my semen jumps out from my cock but this time my cock was erect but now my semen was not coming iam in a hurry to join my sister in the study room but my cock isn’t spilling semen i moved my hand very fast but no use so i left the underwear and were my pant in hurry and came out of my room and joined my sister she was reading after an hour we got bored and left the study room she went to her room and i went to mine,as i saw she is in her room i turn on the tv and started to see ftv to get the mood my cock was taking it and very fast it reacted and became erected suddenly sounds are coming from my sister’s room i peeped form key hole to see what is she doing as i was in guess she is changing the dress she took of the top and jeans and ready to wear night dress as i was seeing she had a very huge breasts her breasts are hanging down as it was looking down and

Her belly was very slim and her pussy was covered with less hair as i can see her pussy lips she was searching for the dress and she found her dress now she is wearing the shirt with no bra and pant with no underwear as she thought it would be free to her she finished her dressing and ready to come out i ran out near sofa and seeing tv changed channel as i was seeing the tv she went to the study room and reading i turnoff the tv and i headed to the study room i kept book in front and i was starring at her breast and pussy secretly my cock is throbbing in my pants as my cock was erect my pant became bulge as she could see but she is busy in reading her books i was bored of reading as i saw her i again went to my room this time i left the door closed but i did not lock it my 6 inches cock became erect i was thinking of my sister and i put before her picture i was moving my hand slowly to enjoy the hand job after a few seconds my sister suddenly came into my room to ask some doubt in biology she saw me naked and shocked she was there shocked and standing in my front i was in hurry and covered my cock with blanket she suddenly ran out by closing door she went to her room and closed the door,i quickly wore my pants and went after her my erected cock was bulging in my pants with that i was running after her I am felling shy and did not talk to her after a few hours she came out to study room where i sat there and not seeing her she is in a angry mood she is bit shy about that situation and i did’n want to ask her about that thing i said “dinny I am sorry i was in no sense that u could come I am very sorry” she is

Not talking to me i skipped to why you came to my room? I questioned her she said i had a doubt in biology i asked what is that she said about the female reproductory system and male reproductory system i said i will clear your doubt but it would be pain ful to you, she said “what?” why so that ” i said “dinny if i said it in words you cant understand that but if i show you in practicals you may understand it very quickly and you can remember for your exams” ,”but why pain” she asked, i said “you will understand later” i said “dinny lets goto your room” and i took her to her’s room and settled on her bed i said” dinny if you want to remember it well you should do what i said ” she agreed for it i took her book in hands and kept aside she was looking why is he doing like this i slowly raised my hand she was looking interestly and i suddenly put my hands on her breast and squeezing it she is bit scared and ran out of her room and she is in study room she said” what are you doing ,iam scared” i said nothing just clearing your doubt i said she was in shock and i slowly went near her i said”relax dinny i am not going to hurt you” and kept my hands on her breast and squeezing it she was bit crying but i make her calm down and gently squeezed her breasts she was moaning and crying tears are coming out her eyes ,her eyes were closed i slowly removed her shirt and slowly massaging her breasts, her breasts were hanging down and juicy slowly i said “open your eyes” she is scared a bit and i said” dont be scared i wont harm you dinni” as she opened her eyes slightly and seeing her breasts i continued massaging i said “this is called breast” it is a milk producing organ to females she opened her eyes fully and was shocked to see her breasts very large than normally she was shocked i said” when you are supposed to do sex, it enlarges more than normally” she is looking at her breast and i said”dont get scared its okay”she said “i dont know this thing enlarges but it very huge when enlarged” slowly i removed her pant buttons and pulling it out she is not scared now,

I am rubbing her pussy with one hand and with the other hand i am massaging her breasts i said “how is the feeling now is it uneasy for you” she said “i have never experience this felling till now but it is happy “i continued rubbing her pussy i suddenly put my middle finger in her pussy she is now moaning very loud i asked her how is it she said”bhayya please take it out it is paining for me a lot” i said it woun’t pain any more and i continued to move my finger out and in now she is screaming “uhh ohhh uhhhh ohhhhh” my cock in pant is throbbing in pain i am surprised that I am seeing my sister nude, she is screaming and making sounds of pleasure i said” dont scream loud so that our neighbor’s could come into our house then she lowered her voice but she is screaming uhh ohhhhh she is moving while I am taking my finger out after few seconds i took off my hands she is now settled down now and fully loaded i said “it is the reproductory organ of female from here the baby comes out by pointing out her pussy” she is now looking at her pussy and asked “How is baby supposed born from here” i said ” i will tell you that ” i slowly took off my pants my cock is still throbbing and fully erected by pointing my cock i said “it is the male reproductory organ” she shocked by seeing it this is how it looks like i said she is looking very interestingly i said “touch it , she put her hand slowly,” “How is it feels” i asked her she said “It feels like a soft sponge covered for a steel rod” i said it looks like it i said” when in the mood of sex it become erect like your breast got enlarged” she is looking around my cock and touching it suddenly a vibration started in my cock it looks like current is passing from my cock she is turning round and seeing it i said “it

Is the male reproductory organ called it penis” and “yours is called vagina” she is now my student listening very careful to my class i said “by moving the skin around the penis up and down,a liquid is produced after a certain period it is called semen” i said “this liquid comes out from your vagina too” she is seeing it as she had a lovely toy in her hand i said “pull down the skin” she said “why?” i said pull it down she pull my skin down and saw a pink head i showed it and said “this is a glance ” she is looking very intrestingly she asked how is a baby born from this i said ” wait and i said “open your legs wide ” she opened her legs wide and hold it” as she is holding her legs i suddenly pushed my penis in her pussy she screamed ooohhhh very loud i said”keep your voice low” she said sorry i am having pain in it she is now crying for take it out i just did not move it after a second she settled but still crying i said it is the pain of pleasure she said how could be called pleasure while it causes pain in the crying tone i didn’t move my cock as her pussy is paining i slowly moved back she is crying more than when i inserted it ok i said i would be pain then after that i slowly took out my cock and inserted again she is crying for not to do that but i said “it would be nothing pain after all” and inserted my cock again she is crying and moaning ohhhhh uhhhhh after a 2or 3 movements there is blood on my cock i showed it to my sister dinni when the layer inside your vagina tears this blood comes she is scared now and pulling my cock out now her pussy mussels became very tight and my cock is feeling the pain i put my hand on her breasts and started massaging then slowly it became loose i said “it would be happen first time only and not any more” she is scaed now and i continues to move my cock out and inside her pussy now she is feeling a bit pain she said my pain is now reduced i said it happens so then i fasten the movements she is moaning very lous uh uh huh ohh ohhh, i made it very fast and my cock touched her bottom of her pussy she is now wild in mood she is moaning uhh ohh i continued moving out and in very fastnow she is moaning very loud after a few shots i took my cock out she said “why did you do that while i was enjoying a bit” i said i should take it out if my seamen comes out in your pussy probably you can be pregnant she is now deeply shocked

She is now scared that she could be pregnant i said ” no it did not happen my semen did not come out”she now relaxed i said “dinni give me your hand ” i took her hand and put it on my cock and said that to move my skin up and down she asked why i said “do it and watch yourself” she is now surprising she kept her hand on my cock and giving handjob she is moving slowly i said “move slowly first and move fast when i said to move fast” she is now moving my cock slowly current is passing through my cock she did for few seconds i said to move fast she moving fast while she is moving fast my cock ejakulated my semen come out form my cock like a fountain my semen fell on my sisters hand and on her belly she is now what is this thing coming out from your cock its like sticky i said” its my semen ” it contains sperms which help in producing a baby she is surprised now i said ” open your mouth and close your eyes” she asked why? I said do it she closed her eyes and opened her mouth i put my cock in her mouth and said move your head as i move it she nodded and i caught her hair firmly and move her head up and down she opened her eyes and asked why that i said ” it is called mouth fucking” she said i have learnt a lot that i am sure to pass my exams as it was finished we both went to the bath room and i said to her clean my cock and i will clean your pussy she started cleaning and i started cleaning while

Cleaning i said in sex there are some poses that we can enjoy a lot she said what are they i said turn back dinni and bend to your knees she did it i opened the shower and put my cock in her pussy from back she is now enjoying the movement i hardly fucked her and after that we both went to her bed room and she is not shy any more to me and I am too she wore her dress and i am watching it and after that i wear my pant and we both sat on sofa and watching tv in then i went to my room and took out a cd from my desk and going to put it on dvd player dinni asked what is it is it any movie i said what it carefully and it is a porn movie disk and i showed a few more positions in sex she asked how do you know all about this i said i watch porn movies regularly she is shocked now and i showed a few more positions i removed her dress and put her legs wide on sofa and i inserted my cock in her pussy she is moaning uhh uhh uhhh uhhh after that i took my cock out and put it in her mouth to suck she gave me a good blow job while she doing i ejaculated in her mouth she spitted it out saying that it tastes familiar but i cant swallow it i said its okay you are going to know many things about this after dinnis exams over and holydays in holy days we went to our uncle’s house there my uncle gave us more privacy at my uncle’s house i fucked her more than 3 times and after that we are supposed to come back to our home while coming back in train we had a reservation a got berth’s to sleep and i fucked well my sister in the train way along to my home she is now in her intermediate and iam still continuing with her stay for another episode what happened to my dinni any body want to mail me about another stories you can mail me at

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