I Don't Want to Be Just an Omega!: I Was in My Sister's Bl Manga When I Reincarnated in Another World

Aspiring manga artist Taisei Kuji is an assistant to his sister, a popular BL mangaka. One day, Taisei was unluckily run over by a truck and found himself reincarnated into the omegaverse world drawn by his sister! (Source: Fusion Product, translated)