"After meeting a god and crossing over to another world, I became a ferocious-looking black horse!

I thought I was the 'Ma-wang' [Horse King], the king of horses, but I was actually the 'Ma-wang' [Demon King] who would destroy this other world!?

The story of an NTR Demon King who steals other men's women with a vicious horse d*ck in a dying other world.