Haruhi's Cousin (Hikaru and Kaoru x f!Reader)

(Reader is described as female and uses she/her pronouns and Japanese (being haruhi's cousin), sorry if this doesn't fit your description.) Haruhi has a wealthy cousin that the hosts never knew. well, she never told them anyway. until one day, she decided to visit Haruhi and the boys, and of course. the Twins met her...