@Mommy
Ooooh thank you! It took a lot of digging, but from your info I was able to find it, it's called 'Guide to Raise a Loyal Dog'! https://mangabuddy.com/guide-to-raise-a-loyal-dog
Pls rec me series with male antihero/villain MC!
To the BL readers:
Spoiler!
Pls g** rec me any series where the protag tops! 
I'm desperate, they barely exist!
My list so far: /manga-list/145372