The Oscar Wilde reference kills me because it's so obscure, but basically he was a famous writer/poet. He was extremely flamboyant and openly gay, and a lot of his works have themes of homosexuality and he is a very important cultural figure for gay rights. He unfortunately sentenced to prison for comitting homosexual acts (This was like in the 1800s.) Hence why instead of saying Kasumi is writing BL fanfics she just says "you know, like Oscar Wilde style stories"