Tanjiro woke up in a place he didnt know and he was chained!,suddenly a black figure approaching behind him!who is it?

This is a fanfic about " If Tanjiro Came back Home earlier

Muzan keeping Tanjirou as a posession. Mature content. Child x adult.

Tanjiro: *touches Muzan's Shoulders* The shippers: *screams* I S H I P I T UvU

Yaoi warning- tanjirou wakes up to find him self in a disordered building, and not only that, he feels weak and is chained up but doesn't know why, continue reading to find out.