Sebastian took the soul of Will's best friend when he was younger(he and his friend were both 16-17 at the time) and he remembers him and Sebastian remembers him aswell. That's why other William hates Sebastian so much.
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Black Butler Headcannons
FanfictionAs the title saids. These are not cannon, they are my theories and/or headcannons about the show.
Sebastian & William
Sebastian took the soul of Will's best friend when he was younger(he and his friend were both 16-17 at the time) and he remembers him and Sebastian remembers him aswell. That's why other William hates Sebastian so much.