I Became the Main Character’s Demon Sword

I was suddenly possessed into a romance fantasy novel where the mentally broken protagonist Rohan finds comfort and grows to love a bright and kind saint who soothes his heart. But I possessed the cursed demon sword – the very cause of the protagonist’s suffering that eventually gets sealed by the temple. “When you need a sword later, I’ll become your sword.” Making promises that couldn’t be kept, I decided to take care of the protagonist who lost everything overnight, at least until he goes to the temple. But somewhere along the way, raising him became genuine. *** “I wish Arfel would stay with me forever…” Despite being barely a whisper, Arfel could hear Rohan’s words more clearly than ever before. Somehow, their chest felt full. Though the reason for this satisfaction was unknown, they gladly accepted these feelings that came from Rohan. They poked his chubby cheeks with their fingers. This is what people seem to find cute. They kept gently pressing the squishy cheeks that gave way each time. As they kept touching his cheeks, Rohan suddenly lifted his head from their shoulder. Though he didn’t say anything, Arfel somehow felt Rohan’s gaze asking, “What about Arfel?” Arfel, who had now learned to naturally wear a faint smile like Rohan, answered: “Me too. I wish I could stay with you forever, Rohan.” You’re the only one who has meaning to me.