Shaking her big booty.

She be enjoying herself and expressing it

That is true. Even though Sophie is the biggest twin, Lexi is trying to catch up.

Before she became a sexy fat ass maid, some part of her medical knowledge mind had the true inner desires of a professional sexy fat ass maid. With how she’s shaking it and taking great satisfaction in what she does now for a living, I think it’s fair to say she’s happier doing this while growing fatter still. I also happen to wonder if her appetite might rub off onto her co worker as well too.

Lexi's letting all of her true self free, and showing it off to everyone who can see which in this case there should be a very wide view of it.

a VERY wide view of it indeed. In fact, even wider than usual

Wide enough to maybe take an entire sofa on its own. Of course, telling her that she'll take it as a compliment.