BL Gensakusha Saikyou! Wagako wo Mamoru tame ni Tenseisha wo Gekitai suru!

The author encounters an eccentric reader online who is preaching about the male-female pairing of the seme from his BL work and a supporting villainous lady. He speaks so badly of the uke that the author can't help but argue back, but while arguing with the reader, his computer suddenly leaks electricity and he passes out... When he wakes up, he has been reincarnated as the uke in "Odd-Eyed Butler"! What's more, that eccentric reader has also been reincarnated as the villainous lady, and is ignoring the original story and making advances on the seme in an attempt to marry him. In order to protect the pairing in his work, the author sets out to repel the reincarnated person, but...!?

[Source: CMOA (translated)]