The first twilight breather

What if tanjiro had the mark from birth? what if he learned not only sun breath from a young age, but also moon breath? What if his mark contained a piece of yoriichi and michicatsu's souls, allowing them to guide him, as well as giving him other speical abilities? What if nezuko went with tanjiro to the town with Tanjiro, never becoming a demon, and what if, rather than giyu, they were found by Rengoku? Well it is time to find out.

The art, character's and demon slayer in general do not belong to me. Also this is my first story, so I am open to constructive criticism. Please have a beautiful day!!!