The Serpent Hashira was known for his silence, his sharp tongue, and his piercing eyes that missed nothing. People feared him. But what they didn’t know was that behind that mask and those cold words was a man who watched you more carefully than anyone else.U were also a HASHIRA but not just a Hashira — you were the heart of the Demon Slayer Corps.And that heart… belonged unknowingly to Obanai Iguro.That day, a group of Kanoe-ranked demon slayers had returned from a long, exhausting mission. The courtyard of the Butterfly Mansion was buzzing with activity — healers running back and forth, water being fetched, wounds being bandaged.You moved among them with a calm grace, your haori fluttering gently as you knelt beside a trembling young slayer. “You did well,” you said softly, tying a clean bandage around his arm. “You’re safe now.”The boy blushed, eyes wide. “T-thank you, Hashira-sama…”You smiled, oblivious to how his friends were also staring — awestruck, grateful, and maybe a little bit in love.What you didn’t see was the pair of sharp eyes watching from afar.Obanai stood by the entrance, Kaburamaru coiled loosely around his neck, his expression unreadable beneath his bandages. His grip on his sword tightened as the air around him grew tense.“Obanai?” a familiar voice called out.It was Sanemi, who had been passing by. He frowned when he noticed Obanai’s clenched jaw. “Oi. You good?” Obanai didn’t answer. He turned abruptly and walked past Sanemi, his footsteps echoing harshly against the wooden floors. The next thing Sanemi heard was a crash — a solid thud that made him flinch.When he followed, he found Obanai’s fist embedded into the wall.“Damn it,” Obanai muttered under his breath, breathing heavily. “Why does she have to smile at everyone like that?”Sanemi raised an eyebrow. “You mean her? You’re jealous again?”Obanai glared at him. “They look at her like she’s theirs to admire. I can’t stand it.”Sanemi sighed. “You know she’s just being kind. That’s her.”“I know,” Obanai growled. “And that’s exactly why it hurts.” Later that night, Sanemi found you sitting under the moonlight in the Butterfly Mansion’s garden, the wind playing gently with your hair.“Oi,” he called out. “Your serpent boyfriend nearly broke his knuckles over you.”You turned your head, startled. “bf?.."Sanemi nodded, smirking. “He saw those boys blushing at you earlier. Didn’t take it well.”You blinked in surprise. “He… what?”Tch. Guy’s got it bad,” Sanemi muttered and walked off, leaving you confused and oddly flustered.A few days later, Obanai returned from a mission, covered in blood and dust. He didn’t like being treated by the healers, but they insisted he stay in the Butterfly Mansion for at least a day.When you heard, you went straight to his room.He was sitting on the bed, mask still on, Kaburamaru resting lazily around his arm. His eyes widened when you entered."...You shouldn’t be here,” he said quickly, his tone sharp but uncertain.You closed the door behind you and smiled softly. “And you shouldn’t be punching walls.”He froze. “…Sanemi.”You giggled softly. “Who else?”Obanai looked away, clearly uncomfortable. “I— it wasn’t—”“Why did you do it?” you interrupted gently, stepping closer.He tensed, his shoulders rigid. “Because I hate it,” he finally muttered. “I hate when others look at you like that. When they act like they can have your attention, your smile. It makes me jealous.."Then he looked down, whispering almost brokenly, “I know I shouldn’t feel this way. You’re kind to everyone, and I’m just… me. Ugly. Scarred.”Before you could speak, he reached up slowly and untied the bandages around his face. The cloth fell away, revealing the long scars that stretched from his mouth to his ears.He kept his gaze lowered. “This is why I hide. I didn’t want you to see. I didn’t want you to think—"You moved closer before he could finish, your fingers brushing against his cheek. He stiffened at the touch, eyes wide.He swallowed hard, his breath trembling.Then u kissed him,he was trembling,u pulled back,he was staring,u kissed him again he blushed.