Obara x (Koganegawa's cousin!female)Reader

                                    

                                          
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AUTHOR'S POV
"Koganegawa, you have more energy than usual," Futakuchi noted. "What's up with that?" 
"My cousin is coming over for the weekend and I'm so excited to see her!" he exclaimed. "She said she'll be here this afternoon, but I didn't get any more news from her since this morning." 
Futakuchi took interest in the girl. "Do you have a picture of her?"
"Mhm! It's from when we were younger." He showed his captain a picture of you back in junior high. You and Koganegawa were holding up your little victory signs while holding onto each other. Futakuchi noticed the volleyball uniform you were wearing. 
"Does she still play volleyball?"
"Yes. She plays for the Karasuno women's volleyball team!" By now, all the boys were looking over Kogane's shoulder to see your picture. Obara managed to get a closer look, being seated at the yellow bird's left. 
"She looks like you. Are you sure you're not secretly twins?" he asked. Koganegawa kept scrolling through your pictures. 
"People always confuse us for twins but we're not," he said with a chuckle. "Even though we do look alike. But, I think she's even more spontaneous than I am."
"Wow, that's a big word," Futakuchi teasingly said. "Do you even know what it means?"
"Don't be rude, Futakuchi," Obara replied. 
"Fine, but I'd love to see the second angry bird look alike," the team captain concluded. 
"Look no further for the Red Bird of Fury has arrived!" you said, appearing in the hall. 
"N/n!" Koganegawa ran to you and twirled you around in a bear hug. "I missed you so much!"
"I missed you too! Wait, we have to do our special intro!"
"Right, I almost forgot!"
The boys tried not to laugh as you both did your "special intro."
Koganegawa started you off. "Ki, the yellow bird of speed!"
"Aka, the red bird of fury!" you continued. "And together we are—"
"—The Angry birds!"
The boys were fine until your final pose. They couldn't hold back their laughter any longer. Even Aone was struggling to keep it together.
"Wow, that was refreshing!" You stretched your arms above your head. "It's been a while since we've done that."
"Last time was at the junior high graduation."
You started snickering at the memory. "I'll never forget the look of pure embarrassment on my mom's face. So who are they? Classmates? Friends? Oh, is this your harem?"
"They're my teammates! What's a harem?" Koganegawa said without a clue of what you meant. You patted his head, reassuring him it was nothing. You stepped over to the boys who were still recovering from their "episode".