When I was twelve years old, my parents would frequently have business trip, leaving my and my eleven year old brother alone. My parents never taught me about sex. Once when I was showering, my brother came in while I was undressing. He told me to lie down, so I did. He then took off his clothes and started fucking me.
When writing your story, please use correct spelling and grammar. Please use a capital I rather than a lower i, and use apostrophes correctly. Such as I'm, don't, can't.