Sabrina being hermetic means that certain morals and manners around folks have deteriorated. For instance, while she will invite you to stay over for the night, seeing her change or wash her clothes in the buff or close to it is not uncommon, especially since she feels no shame for it. Asking her to have sex? Different story...
It is also an excuse to draw a furry girl in her underwear.

Sabrina Ryder (C)  prdarkfox