Discord couldn't face Celestia today.
She would see it in his face if he did. He knew she would. She always knew if something was wrong with him and disturbingly often she could even guess what it was about, in a general sense.
He couldn't afford it now. It was just too horrifying for her to find out. Ever.
The draconequus closed his eyes and coiled up tighter, unable to stop shaking. Unable to get the smell of blood from his nose. Quite possibly because he was almost sure he was covered in it. Almost. He hadn't checked.
Oh Chaos, what had he done.
If Celestia-- no. If anypony found out he would be done for. He would be a statue for the rest of forever, regardless of his relations with a Princess. There was just no excuse for this. This kind of thing just wasn't done.
Discord felt like throwing up again. But at the same time he couldn't move from his spot.
The world was spinning so he lifted a shaky paw over his already closed eyes in hopes that it would stop. The smell of blood got stronger.
It was on his paw, wasn't it?
Discord could see the pony vividly in his mind. Purple coat, pink mane, yellow eyes. A unicorn mare. And she had the look on her face. That is, before she was covered in blood and her face was twisted into a look of horror.
How could he ever run his paw through Celestia's mane again? He could wash the physical blood away, and he needed to do that soon or the smell would drive him insane, but he would know.
He would carry this secret forever.
If he could.
Please, don't ever find out, Celestia.