That’s not good…

well crap this just turned pear shaped fast.

It's always nice to see a stallion on woman clop, it's pretty rare these days. However

She had settled on smaller than average so as to not hurt the human. There had been confirmed reports of mismatched anatomy colliding with overly enthusiastic partners. The changeling cringed, remembering how long it had taken to get it right to wield an organ meant for a receptacle three times larger.

That size difference is ridiculous. With canon proportions, a stallion's dick would literaly be bigger than a mare's entire torso. Not to mention this

And from what I’ve heard, plenty of human males have found visiting a pony settlement during times of heat could be quite fun if they are in the mood for sex

would never happen. The best case scenario would be the mare not laughing at the guy's dick while asking him to leave. No amount of skill or "muh human stamina" could overcome what's basically throwing a hot dog down a hallway. I would recommend editing this paragraph to tone it down significantly. Or better yet, get rid of it completely; people calcked our equipment to be more or less the same size. Besides, she is a changeling, she can just make herself bigger for size queens without condemning men to mare celibacy.

Its twin .32 rounds slamming into the shocked mans chest, mushrooming as one passed through a lung, the second nicking a rib and the sternum fragmenting a bit before shredding his heart

That escalated quickly. Shoudn't the story have Death and Dark tags? Would be nice to have a warning. My empathy for the changeling pretty much evaporated after this. Can't relate to a cold-blooded murderer. Hope she gets caught and jailed for this.

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I'm gonna have to disagree with you there. Not on mare to stallion sizes, that was an error on my part, I'll work to adjust.

But the escalation happened on his end, he brandished a weapon, and justified deadly force on her part immediately.

I had written out the scene differently a couple times until a friend came up with the hidden gun, in accordance with a changelings philosophy of misdirection and stealth. First I planned on her turning to her natural form and springing at him, then I had her with a .38 special revolver, then I settled on the hidden gun. He was threatening her life, she was justified in responding the way she did. People don't realize exactly how dangerous a person hopped up on meth with a knife can actually be.

That being said, I will make the point further along in the story, she is an unrepentant predator, so she feels little compunction on taking a life. But she's also cautious, because she doesn't want to get caught. One thrust of this story will be how she evolves from being a predator outside of society to being a participant. More will be revealed as the story progresses. If I've lost you, I'm sorry, but I'm writing the story how I see it.
But most of all, thank you for commenting your thoughts, input is very much appreciated.