Lunas' detective ageny

Derpy was shocked and stood there for a few moments and then started to move toward the door when she saw a piece of torn clothing, she grabbed it and headed out the door back to the agency. When Derpy entered she headed straight to Luna to tell her about the shop keeper, Derpy burst open into Luna’s office spurting out all the details of the shop incident, after she was done Luna was confused at what it all meant, Derpy remembered the evidence she pick up at the store, Derpy presented the torn clothing to Luna, at once Luna knew who did it, she told Derpy to get ready at once as she set off for her carriage. Derpy accompanied Luna as soon as she was ready and they set of toward Canterlot.

When they arrived at the castle one of the guards was missing but Luna didn’t seem to care she was serious about her current business, Derpy had no idea where Luna was going but she quickly figured it out after they turned down the long corridor towards the princes’ room as they reached the doors they heard a loud commotion and muffled screams, Luna grew worried as the killer would get another kill before she could stop him.
She broke the door down and saw the horrifying sight of Prince Blueblood raping his loyal guard in his ass after he chewed the guard’s dick clean off then with all his might Blueblood he forced his hard cock through the torn flesh where the dick used to be and didn’t stop until he penetrated and when he did he realized that Luna was in the room he got on his hooves and bucked the guard to death and focused his eyes on Luna he charged with terrible intentions in mind. Luna tried to defend herself but Blueblood knocked her onto her back ready to mount her then nobody expected what would happen from out of no where a bullet ripped through Blueblood’s head dropping him to the ground instantly, Luna looked around to see where the bullet came from, no one was around then she looked back and standing in the door way was Derpy holding a gun (I know Equestria doesn’t have guns but it’s a good twist.).
After the incident and after everyone had grieved about the string of murders in there community, Luna returned to work and promoted Derpy to assistant detective Derpy, Derpy liked it very much she could now meet a lot more people, Luna was happy that Equestria was safe now she could calm down and rest. Everypony was happy now.