Demon Dragon

Luna was in her room in the castle in Canterlot, and was currently reading a letter sent from miss Drop. Apparently she had forgotten to inform of his second vault.

Dear Princess Luna, the princess and goddess of the night.

I have forgotten to inform you, that Prince Spike has a second vault, wich I believe is his main vault. It holds over fifty million dollars, and is rapidly growing because of his businesses. He doesn't stop by very often, in fact, I believe it's every third month or something like that.

I don't know of all his businesses but if you would want me to, I could search to see everything he owns.

Water Drops.

Luna was sitting down in shock, Spike is very very, wealthy. Heck, he could buy Saddle Arabia, and Griffinstone and still have enough money. Luna couldn't believe it.

"If my sister finds out, then I don't know what she'll do with Spike." Luna said, in a whisper to herself.

Luna then felt a presence, one she hadn't felt over a few year's. Looking back to where her exit door was, stood an very smoking hot Nightmare moon. She was wearing only her underwear wich only consisted of, a bra and some panties all Moon themed. Her skin was black like Chrysalis and her mane flowed with stars. Her eye's were predatory looking. Her hands were resting on her hips.

"Well hello Luna, long time no see." Nightmare moon said, smirking.

"I'm sorry about that. Well, we have time now. So what have you been up to?" Luna asked, sounding generally curious.

"Well, I traveled to Hell where I got a home from Spike. Other than that nothing interesting." Nightmare Moon said, as if it was normal.

Luna froze. Spike? Hell? What was she talking about?

"Uh, Spike? He... he went to Hell?" Luna asked, baffled.

"Not only that dear, but he is also the second most powerful demon there is. I also believe he is royalty in the demon world also, I don't exactly follow their new's." Nightmare Moon said, thinking about it.

"Wait, wait, wait! Spike, my nephew is a demon? How? When?" Luna started asking, feeling questions bottle up in her.

"Well, from my understanding, he was visited by the demon king Lucifer Morningstar, and received demonic powers by him. He got his powers when he was seven." Nightmare Moon explained.

Luna was stunned, but then it all made sense. He had gotten angrier from the years that came, and became cold to anypony who he claimed "pretended" to care. This could explain his estrus not taking effect. Either because he is very powerful demon, or because he did have an early estrus.

"Starting to fall in place huh?" Nightmare Moon asked, amused.

Luna blushed in embarrassment, and quickly looked away. Nightmare Moon laughed a little and walked over to her. She placed her melons on Luna's back, making her blush fiercely.

"We-well I think it is. Anyways, what else have you been doing?" Luna asked, curious.

"Well, I have gotten to know Chrysalis well. She is very good in bed, not surprised our nephew took her, she is without a doubt a keeper!" Nightmare Moon said, making Luna become very red from her blushing.

"Well, it looks like you're investigation is closed detective~ Nightmare Moon said, in a seductive voice.

They had amazing sex, wich even Luna had to admit was fantastic.