I woke up as the second male lead's sister in a steamy BL novel

Lily suddenly wakes up in a hospital after taking a bath, and someone is saying he is her brother, Daniel Janssen. Then, another guy arrives and introduces himself as Lucas Gray, her best friend. After running away from the nurses, she unexpectedly met a familiar face—her first love in high school. But why does he have a different name? Matthias Desmond? Lily couldn't understand what was happening, but then she remembers—those names sounded like the characters from the steamy BL manga she was just reading. Her brother as the charming second male lead, her best friend as the sweet uke and her boss as the cunning seme. What on earth is happening? ---- Please follow my Instagram @imsquideli