Here, as promised to all bros of SgSexForum, the revised edition with all names of the school changed.
NOTE: I did not write this story myself

Story of a local girl from a local girl school.
I was 16 when I gave my first blowjob. He was (still is) my brother-in-law. But at that time he was actually my stepsisterÂ’s boyfriend. Let me explain.
My mother was the second wife of my father. His first wife died when my stepsister was only 6. She was an only child. He was only in his mid thirties and the eldest son in the family. He was a businessman and the family was quite well off. So naturally his mother persuaded him to remarry. I was the eldest of 2 girls and a boy. Shortly after my brother was born, my father passed away. We were staying with my grandmother, my fatherÂ’s mother. She was the empress dowager of the household and she didnÂ’t like us especially my mother. She blamed her, a tiger, for eating my father, a goat.
My mother came from Indonesia and so had no family support and anyway she had little education and so didnÂ’t work and was totally dependent on her mother-in-law. My grandmotherÂ’s favourite was my stepsister. Although she didnÂ’t really ill treat us I couldnÂ’t help harbouring a sense of jealousy over step-sis who wasnÂ’t particularly sisterly towards us either.
We stayed in a single storey bungalow in Katong, a short walk away from Kum Lan Convent where I attended primary school. In the fifties and sixties Kum Lan was famous for notorious school girls, you know the Eurasians and babas... Even in primary 6, I remembered having classmates who discussed about sex and passed around playboy magazines they had ‘borrowed’ from home.
I had already started exploring my body at the tender age of 13 when my pussy was still hairless and my chest flat. It felt nice when I rubbed my vagina and applied pressure on my clit. One day after a prolong session in the bathroom I felt my body shuddered and I felt pleasantly ticklish all over. Years later I knew that was my first orgasm. Needless to say I was hooked and masturbation was a daily affair. I also developed a perverted interest to peep at my step-sis. She was about 7 years older than me and she wore bra! After school she would often strip off her uniform and walked around the house in her bra and panties. We were all female except for my little brother who was too young to know anything.
I remembered envying her because she had breasts and she had hair down under between her legs. She had already started shaving her armpits. I used to check my pubic area for the first sign of growth and would often try on her used bra which she left in the laundry basket in the bathroom. I remembered sniffing at them too envying her usage of perfume.
Soon she began going to parties and dating and boasting to me about the boys who were after her. She used to bring them home to discuss and do homework. But I knew there were many occasions when they sneaked into her bedroom when grandmother and mother were taking their afternoon nap. Of course she bribed me not to tell by letting me dab on her perfume and try on her lipstick! We stayed in adjoining bedrooms separated by a shared bathroom and I used to peep at them through the keyhole. Well...I did see them smooching and fondling each other or rather the boyÂ’s hands would be all over her body. Needless to say it got me horny and I had to pleasure myself under my blanket.
To be continued....