They were an unusual family.
Vicky's boyfriend had left her after he learned she was pregnant, days following her 16th birthday. Having only a sister who never did anything to help her since their parents' death, the young woman had to work even as she was pregnant with twins and this was a factor that contributed to her remaining single for the next few years.
In her mid-thirties now, Victoria was in her prime but didn't think so, unable to recognize her own beauty. She had a full figure, nicely rounded hips and narrow waist that accentuated her perfect ass, with high and firm breasts that gave her one hell of a cleavage no matter what she wore. Despite all this and despite the fact that she worked in an office, Vicky had dated very few men in the last years. Her hair was now blonde and quite long, usually pulled back in a cute ponytail that made her look younger, framing bright green eyes that were warm and sincere.
Of course, she spent most of her time taking care of her kids. Growing up, she had a special relationship with her son since the two of them were very close, having moved in a small remote village in Peru. Never knowing the modern world and having never been on the Internet or seen much TV, Tomas grew up quite innocently and most of his world was his job and his mother and sister, to whom he also was very close and the two were quite affectionate. The three of them had always been very comfortable living together and there was no shame between them as far as partial nudity and physical closeness went. Knowing how kids are and not wanting hers to become curious with each other as they grew up, she decided to give Lara the second bedroom while she and Tomas shared the master bedroom. Vicky's bed was a king size and very large so from the age of ten until the day of his 18th birthday Tomas shared his mother's room.
Physically, Tomas and Lara were both the same height and similarly slender, and had the same eyes and even the same hair. Lara was slow to develop, her breasts refusing to grow bigger than barely a handful, hips still narrow and she was pretty thin but had such soft skin and nice lean legs.
Everything was almost normal until the twins turned 18. Before that, the three of them sometimes saw each other naked in the bathroom and it wasn't rare for them to wash each other's backs while one was in the bath tub. While she stopped being completely naked in front of him sometimes during his teen years, Vicky still wasn't shy in front of her kids as she would strip to her underwear in their presence. Having spent the last almost two decades alone together, the three of them were very affectionate with each other and told each other everything, but Tomas and his mother were particularly close. It was regretfully that she had to stop taking her showers with him when he entered puberty and she also became more careful with how much of her he saw, and how much of him she saw. She made sure the siblings had limited contact of that nature, wanting them to grow normally.
On his side, Tomas' curiosity and hormones didn't go out of control as much as most of the boys his age and didn't even truly masturbate before he turned 18. As unlikely as that seems, Vicky had decided not to talk to Tomas and his sister about sex and while she wasn't sure it was the right decision, it mostly worked. Tomas of course had touched himself as he grew up but had never once gotten off or truly masturbated and had no idea how good it felt. It was the same for Lara and she had no real sense of being sexy, wearing sweat pants and boyish shirts when not outside in light daily clothes. Of course over the years it did happen that the two siblings happened to see each other almost naked, in the bathroom for example, but Tomas had little to no idea of the anatomy of women since he didn't see his mom and sister that way.
On her kids' birthday, Vicky finally decided to have a conversation with Tomas when the both of them were in bed that night, almost ready to go to sleep. At first, the conversation went well and she asked him a few questions about the most basic things, masturbation, arousal, desire, why it happened and all. He was so innocent she thought. While Tomas told his mother about his erections and how often it happened, and that he hadn't really learned to do anything about it, Vicky kept the conversation from becoming too embarrassing for her son. She asked him if he was attracted to girls and he said of course, then spoke about a girl in the village he had been too shy to talk to. But he didn't speak of her sexually much to his mother's surprise, he just described his reactions and his attraction. When her son asked her if it was normal that he got so hard sometimes that it was almost painful and uncomfortable, she said it was, and when he asked what he could do about it, she said that rubbing it up and down would give him some relief eventually. She also wasn't shy to call it a cock in front of him, she always thought "penis" sounded ridiculous even as a teen.
The conversation ended there when Vicky decided it was time to go to bed. They hugged under the sheets and she kept him close against herself for a long moment. Sleepily, Tomas asked his mom if she loved him and she replied that of course she did, that she would do anything for him. That made him smile and he fell asleep. She had no idea that the next day, everything would become different.
PART 1