With all the magic in Equestria, is it even really murder if you don't soul vore them afterwards?

For whatever reason I could see ocellus be semi merciful to the other student 6. If anything instead of making them mindless followers when they are raped and killed she could give them a “half death” still corrupting them but not making them mindless followers. Basically making them the trusted lieutenants to her budding army or perhaps her personal “concubines”.

This is actually a pretty interesting idea! I do like what the previous commenter posted, though, it could be interesting if she put the Student 6 in quite a bit of pain, but of course with its rewards as her friends. Or just torture them a lot due to some internal hatred or something. Of course, I probably won't expect nor come close to what'll happen next.

I didn't expect Cozy to make an appearance, either. Her dynamic with Ocellus could be fun to see, too.

This is nicely written, and I'd love to see how the whole gory shindig plays out!

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Mercy is boring. But I guess I could see that as possible.

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Cozy is there for it to be her fault.

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How has Ocellus change physically appearance wise?

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Not much other than being pale and sharper fangs I think. Though she spends a lot of the story shifted into other things anyway.