DISCLAIMER: ALL CHARACTERS HEREIN ARE OVER THE AGE OF 18. I do not condone any abuse of any kind IRL, and everything herein is just fantasy. Do not attempt to re-enact anything you read here.
The worst part about moving was having to get used to things all over again. Carl was a homebody at heart. He had a natural tendency to sort of settle in wherever he was, and over time make wherever he was more and more of a home. In a way, he thought, it was probably a product of having moved so many times. Carl had had to get used to getting used to new things, and making a home out of wherever he wound up.
Of course, this would be no different. A new house in a new place. Make new friends in the space of a year, knowing you'd one day never see them again, and some day you'd have so many old friends you could never keep in touch with all of them. In a way, it was easier to imagine every year or two he was just going on holiday somewhere new -- an extended holiday where you never went home. Easier than accepting that he had no home, nowhere to go back to, nowhere to ground him.
It wouldn't have been so bad if he had had a strong relationship at home to keep him grounded, but that had been missing for most of his life too. The Liene family was not particularly strongly knit. His parents were academics. Carl was, definitively, not. That wasn't to say that he had struggled at school, quite the contrary. When your life was so nomadic you had very few attachments, which left a lot of free time for school work. Indeed, having moved through so many schools, Carl had learned the hard way the benefit of putting in extra effort to make up for what was lost in translation.
They weren't just academics, though, but busy ones, dedicated to their fields. That left very little time for a child who had very little supporting them outside of the home, so naturally, the internet filled that role. The internet, despite its vastness, its depth, its ever changing nature, had been far more of a structured constant in his life than anything else -- and far more dependable. Indeed, Carl's over-indulgence in the internet from a young age, as well as the maturity the hardships of such a life brought, had led to very early awakenings for the young lad.
That, at least, he had in common with his parents. The family of three spent much of their days, wherever they were, glued to a pc monitor (or laptop in his mother's case)... albeit Carl for far different reasons. The limits of his discourse were on the myriad debates regarding pornography, written or drawn, which a lonely teen with nothing else to do can be so easily drawn into.
Now well past eighteen, Carl could have left "home" whenever he wanted. College was beckoning. However, at his parents' request, he had elected to move with them one last time before shipping off for higher education. He was enrolled in online pre-college courses which would allow him to skip the first year of his degree, and promised to be far easier being done from home, but deep down he knew the reason was his parents didn't want him to leave yet -- especially as they knew he probably wouldn't come back.