Considering how this series generally goes the fluffy and wholesome route, I expect to find out Jervis was planning a big celebration for her sisters and Ark is smuggling things in and out to help.
The Mutsuki's will be there (of course), because Ark asked them for help, and they're the go-to stand ins for innocent kids in-universe. Kisaragi will be teary-eyed adorable and try to convince the Royal Knights that Ark isn't being... Well, Ark Royal.
Or...
Ark really is being Ark. Jervis is being forced to cosplay and the next chapter is going to consist of gratuitous Jervis fan service.
I'd be down for some Jervis fan service.