[ So it's probably nothing that strange that Kashuu would invite in strange new people, but having this one actually living with the swords is probably a little surprise. However, considering Kashuu has explained Sebastian's presence as being an old, lonely spirit that definitely needs some friends. And being offered a place to stay by Haru, well. Sebastian is essentially far too polite to turn it down. That, and he really has no reason to do so.

Still, it's not so bad having this new "spirit" around. After all, there are two things he very clearly enjoys, and that's—

i. —Cooking. It's definitely a hobby of his, but as a demon that feeds upon souls, well, he doesn't exactly need to cook for himself. After working in the Phantomhive household for the past year or two, he's come to enjoy cooking quite a bit. So finally, with people to cook for, Sebastian is more than happy to indulge. It's probably dinner time when you're likely to see Sebastian busily (and quite happily) working away in the kitchen. You can come sabotage, steal a bite, or just ask what kind of definitely Western dish he's making.

ii. —Cleaning. Anywhere there's a mess (or even if there's just dust), you're likely to find Sebastian dutifully taking care of things. Have you exploded any microwaves lately? Made an interesting mess? Sebastian is here to help.

[ come make fun of your weird new tenant... kashuu makes weird friends... I might also add another prompt once the interlude thread I'm in is done, so stay tuned?! ]