Kirishima POV:
"Maybe ice cream?" Denki said out loud.
I shook my head, "I feel like she would get angry if she figured out most of the time I was with you, I was asking you how to treat a girl on her period."
"I dunno, Y/N is already scary without her mood swings," Sero shivered.
"I know, I'm kind of scared," Denki agreed.
"We have a whole week with Y/N on her period, and coincidentally it's the week we need to capture her," Shinsou smiled to himself.
"So stupid-" Todoroki pushed us into an alleyway. We all looked at him confusedly.
"Look around the corner." We peeked, and my eyes widened. A boy was holding Y/N's waist as she glared at him. She pushed him away and seemed to yell at him, before turning away. He was...
"Hot," Denki mumbled, "He looks like he can be a f-cking model." The boy had white hair, and he had a nice figure. He grabbed her wrist, I noticed he wore gloves and a mask. He brought her to his chest and looked down at her, carefully trailing his finger down her back. She slapped him before turning back. She was nearing us so we hid behind a dumpster.
"... don't underestimate me." They walked into the alleyway and paused at the entrance.
"I didn't say anything," his voice sounded hot like hers. "I'm just asking-"
"Which is none of your business," she snapped.
"Darling-"
"Don't call me that, I have a boyfriend." There was silence, before he bursted out laughing.
"You, a boyfriend?" He laughed again. "You got hotter and funnier, literally the perfect-"
"Drop it," her voice was cold, making all of us shiver. "I don't want you near me."
"Too bad, because guess what? Your favorite person is after the both of us."
"Aww," she purred fakely, "You're the stupid ass who ditched me."
"Yeah, well that was my fault," I heard him softly chuckle, "I spent so long trying to find you, and now I finally have!"
"Save it."
"Bring me with you."
"For?" I heard her voice raise, "So what. So you can ruin my life again? Sorry, but I'm okay-"
"You need him." We stopped. We heard Mr. Aizawa's voice enter the alleyway, "No matter what you think of him, he's still your-"
"Whatever," she cut him off, "But if he does any, and I mean any weird sh1t, I'm killing him."
"By the way, why are there a bunch of people hiding behind the dumpsters?" We all froze, before walking out.
Mr. Aizawa hid his smile, "Perfect. Now introduce yourself."
The man stood close to Y/N, and was about to put his arm around her before she elbowed his side, "Stop being gross." She looked at us, "This is my brother." She yanked down his mask, and my eyes widened at the resemblance. He had different color eyes and hair, but their faces looked so much alike.
"Not natural brother," he reassured us, "I was actually engaged to her-"
"You're my brother." She said sternly.
"Well it's more like-"
"My brother," she stepped on his foot harshly. "Moving on-"
"Hm," he narrowed his eyes at us, "You really did work your magic."
"I didn't," she said.
I tilted my head, and the boy smirked, "They don't know! That's cute-"
"He has the power to read minds and emotions, he can also control any living thing. Kind of like Shinsou's, but he can do it by just eye contact, and there's no way to escape from it."
"Y/N's power is-"
"How many times do I have to tell you, that isn't my power." She clenched her teeth. She looked like she was getting annoyed. She held her head into her hand, "I don't feel good. I'm leaving."
"I'm going to school with you!" The boy exclaimed.
She hesitated, before slowly smiling, "Yes! Come to school with me."
"Really?" He hugged her as she patted his chest.
"N-Not too tight please. I still have cramps." He let go of her. She pointed to us, "As long as you don't get in between me and my friends, I'm fine."
"Let me be your boyfr-"
"No." She rolled her eyes, "That hot red head over there is my boyfriend."
The boy narrowed his eyes at me, "Hm, I can beat him."
"Can you shut up?" She rolled her eyes, "Let's go. I'm getting a headache." she started walking, us following her. The boy and her walked a little ahead.
"So is he really her brother?" Sero asked.
Mr. Aizawa squinted, "It's hard to explain if you don't know her past, but basically it's like a step brother thing."
"He seems obsessed with her," Midoriya said.
"He's like Hawks," he mumbled, "Except worse." We all made it to the UA and the boy, who I learned his name as Kivou, stayed with Midoriya and Todoroki.
"Goodnight my beauty-"
"I hope you choke in your sleep Kiv," she slammed the door closed. She turned around and stuffed her face into my chest, and I felt my shirt get wet. I gently stroked her head as I whispered to her.
She looked up. I cupped her cheeks and wiped her tears, "I'm sorry. I don't like him, I promise."
I kissed her wet face, "I know, it's okay." She smiled as I kissed her again. We got ready for bed and I hugged her tightly to my chest. Something felt off, like something was missing. My feelings didn't change, but she looks more scared. When I was sure she was asleep, I carefully lifted her chin up to look at her neck.
Her nails ripped open her neck, leaving a few marks on it. Some spots obviously bled at least a little, making me frown. She was anxious about something. I hugged her again, kissing her head multiple times.
When we woke up, she seemed to be back to normal. She took a shower first, then I went. We changed, her wearing loose jeans and a top suit, buttoning it up partially. We walked out together, and she immediately went out of the common room. I followed behind her. As we walked, people looked at each other and whispered, looking at her. I hooked my arm around her shoulder as we walked. She kissed my hand to go into the teachers lounge.
After a minute, she walked out with papers, just as Kivou was walking down. Girls swooned over him as he walked past. Some even went up to him and asked for his number, but he politely turned them down, saying he was already taken. Y/N didn't look up as she started walking to the classroom.
"N/N, N/N!" He ran up to us, "Oh, hey Kirishima."
"Good morning-"
"Don't talk to my boyfriend," she said sternly. She was reading through the papers and didn't look up to greet him.
