You currently live alone on this yacht. Your fosty mommy left you alone a few days ago to go explore the ruins of an ancient civilization and build more lore to the video game, Sburb, as she, and the rest of her company, made Sburb. That's because your foster mother is none other than Alphys. You find her boring when she's not downright loath able, but in absence of any other parental figure, she sure does make a good mom.
When you were younger, and you were only a recently-made princess, you would cower in the corner of your room instead of sleeping, not only because the bed was way bigger than what you'd experienced before and there were way too many pillows, but you felt alone in the big new world, like you had nobody to empathize with your situation. That is, until Alphys came up to you, rested her scaly hand on your shoulder, and started explaining that the two of you weren't so different, and that she too had a "less than normal childhood home", as she explains, and that she was pulled up from the dumps by a very interesting man, who taught her how to be an excellent member of society, how to be a great scientist and inventor, and how to be a great mother. This man acts not only as a icon to you, a version that your mother believes you can achieve, but also as a weird grandpa to you, if only two fosterships removed.
She helped you adjust to your new situation in a very helpful manner, and this is the reason why you don't just run away from her: respect, and also tons of security cameras built into everywhere you go to "monitor your safety" (still her words).
Anyways, the point I wanted to make was, you don't only live on a yacht, but also live in a mansion on an island also bearing ancient civilization ruins. You just prefer to live on the yacht because you can cruise the pacific without anyone judging... except of course your mother through the security cameras... and the butler who also serves as your sort of babysitter.
speaking of, where is that butter anyways?
"who cares" you say, brandishing the least amount of concern in the world. You spit on the ground, knowing that it will both disrespect him and the condition he keeps this boat in, but it will also buy you some time to escape while he cleans it up, in case you need it.
Your original home, the shack in the woods, was transported via helicopter to your new home, and is one of the locations your mother put on her tourist walk of fame.
The walk of fame, if it wasn't clear, started out as a gag your mom made to put the guests of her lab through a loop, both literally and figuratively, but continued on with her as she escaped the underground and built a life for her own with mansions, billionaire meetings (meetings where the world's billionaires walk into a room and talk billionaire stuff, all real boring), and versaillesesque lawns and fountains. And on this walk of fame, she has cultured a series of puzzles, gags, goofs, and sillywires the likes you've never seen. Like- on one stretch of walk, she has a realistic and explicit statue, depicting the virgin Mary giving her cunnilingus whilst holding baby Jesus and whilst on another statue on the other side of the way, Joseph is watching in horror, though you think it's of him yankin' it to the sight. Either way, the walk of fame is full of shit like that, where some funny thing goes on and several billion people are offended, and your old house is on it.
Anyways, you go to your room to do shit there too.