Issei and his parents abused the Oc or reader because they were born a Yokaî. A jackal no less. If you all think a jackal is a fake animal they're not. Basically Sonic, Shadow, and Silver (they're brothers in this story) take in the reader or Oc and give them the phantom ruby. The reader grew up with Koneko and after she is forced to join Rias's peerage the reader or Oc joins her as well. Little does the reader or Oc knows that Issei is a fallen angel. The brothers clash (Issei and Oc/reader) and the reader (or Oc) and Silver fuse to make Sinfinite (it's Sin-finite). They then mop the floor with Issei making him pay for his sins.
(For those who don't know Infinite here is a picture of him)
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