Help me find this fiction please.

So, I'm looking for this Crossover fic that crosses with harry potter. In it, Draco is summoned accidentaly into a dream shared between Mane 6, 2 Princesses, and Harry Potter.Draco calls celestia a horse, not realising that she would be insulted thinking he called her a whorse. Twilight saves his butt by making it so all other ponies in this shared dream are suddenly held in a forcefeild bubble,but then he makes a mistake. There is a book on the floor that he steps on on accident, and it ends up muddy. So now, all ponies trapped in that forcefeild bubble are just fine being there because they get to watch the show as Twilight chases Draco around the room with seemingly murderous intent.

Draco ends up becoming a good guy, basically immortal, and a Princess.
This fiction was inspired by Tatsourou's "You Can't Spell Slaughter Without Laughter"
I may have some details of this scene inaccurately remembered.
Tatsurou is not the author.

Please help me find this fiction. Unfortunately this is all i remember of it.

I'm still looking for it too