Quick Transmigration to Characters with BE

Bound to a system without his consent, our MC begins his world-hopping journey.

In the first world,
MC: Oi, you said I am taking over an actor's body.
System: *trembles in fright*
MC: Then why am I fucking cat?!?

In the second world,
MC: Oi, you said I'm supposed to be the young master of the house.
System: *cries*
MC: Then why am I inside the mute younger brother's body?!?

And so on... He is informed to take over innocent mob characters and cannon fodder, then why does he always end up inside the bodies of badly tormented characters instead?
MC: System, do you have a grudge against me? Are you secretly an S?
System: ... I'm innocent, ah!

MC is shou/uke/bottom.
1v1, male x male

Warning: This is gay fiction. BL. Has mature content.

DISCLAIMER: The images that come with the story are not mine.