Fics like The vow

Julius notices that there is something greatly troubling Subaru one day, which motivates him to question Subaru about it. He promptly gets a glimpse into a side of Subaru that not even the closest to him are aware of. Greatly concerned for his friend after what he had just saw, Julius decides to uncover the mysteries that surround the enigma that is Natsuki Subaru. That is, of course, if Subaru and a certain jealous witch let him.

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