Requested by the amazing and lovely FredFredEnglish ! All of the prompts you gave me were amazing! I'll probably write more, but I wanted to do this one for now :)
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"Amami-kun!"

The green haired boy let out a surprised yelp as he heard two boys cry out his name in unison. Confused, he closed his book and watched in horror as Ouma Kokichi and Shuuichi Saihara stormed into his dorm room.

"Woah! What's going on? Was there a murder!?" He yelled in confusion, both of the boys dismissively shaking their heads. He felt slightly frustrated at the abrupt interruption, especially considering it was quite unlike both of them to act so loud and abrupt. "Then, spit it out. What's up?"

"It's about your brother, (y/n)-kun," Shuuichi mumbled. His face suddenly flushed pink, the boy nervously scratching his head.

"What about him?"

"We want your permission, Amani-kun!" Ouma yelled a bit too loud for his own good. "You see... Saihara-chan and I... we both care about him a lot..."

"Oh," Rantarou stated bluntly, a neutral expression on his face. Suddenly, it warped into a strange smile, which caught both the detective and the dictator off guard. "Well, you made the right choice to come to me first. But still... you know I'm rather overprotective of my younger twin brother..."

"You can't baby him, Amami-Kun! You're practically the same age!" Ouma yelled rashly, embarrassing Saihara.

"Stop it! You'll only upset him," Saihara grumbled to the shorter boy. "Anyways, what Ouma was haphazardly trying to convey is that we both feel a special bond with your brother and want to see how you would feel about us acting on it."

"You've made a compelling argument, Saihara-kun," Rantarou admitted. "Though, I don't know if I can trust my precious brother to people like you..."

"What about me?" A voice called from the back of the room. Rantarou turned and saw his brother (y/n) walk in from the bathroom, clad in only a thin towel around his waist. While the sight was nothing to flinch at for him, it drove the other two boys wild.

"(Y/n)-kuuuuun!" Ouma yelled, diving at the still-damp boy and pulling him into a hug. (Y/n) clung to the towel for dear life, terrified it would fall and reveal himself at any moment.

"Let go of me!" He protested, the small boy prying himself from him. He then turned to Rantarou, an angry expression on his face. "What are they doing here?! Why did you let them in knowing I was in the shower?!"

"Ah, my bad," Rantarou admitted, bowing his head slightly. He combed his mop of green hair back into place as he turned back to address his two guests. "These two came to visit me to ask for my permission."

The two boys blushed in unison, obviously embarrassed by Rantarou's words. "Permission for what?" (Y/n) asked as he ducked into his bedroom to put on some clothing.

"Don't tell him!" Saihara begged desperately.

"Yeah, please!" Ouma cried.

Rantarou only laughed deeply. "They both want to become your boyfriends."

"Oh," (y/n) murmured, exiting the bedroom clad in a fresh pair of clothes. "Well... I'm glad they came to you."

"Huh, what do you mean? Don't tell me you were in on this too?!" Rantarou asked in confusion, his olive eyes widening.

"He wasn't..." Saihara uttered. "We all have been wondering how to bring our relationship up to you, so Ouma-Kun and I decided to just bite our tongues and go for it."

"Well, in the end, it's not my decision," Rantarou admitted, in a voice that sounded almost sad. "While I understand both of your feelings, I just want to know what (y/n) has to say."

"Truthfully, brother...." he cleared his throat. "I really have feelings for them. They've made my life here so much brighter... just like you and Kaede, you know?"

Rantarou flushed bright red. "Hey! Stop that!"

(Y/n) held back a chuckle. "What I'm trying to say is, it'd mean the world to me if my big brother was accepting of this relationship."

He placed his fingers under his chin, tapping in thought. "Hmmm...."

"Please, Amami-Kun!" Ouma begged, a desperate feeling in his voice.

"Yes... Amami-kun...." Saihara mumbled. His face turned pink, avoiding eye contact with Rantarou. "It's safe to say that I experience feelings stronger than attraction for (y/n) and Ouma. In fact... I... love them."

Rantarou's heart was on the verge of exploding at the sound of Shuuichi's confession. He cupped his hand over his mouth to stifle a squeal.

"Well.." He stated after a while, startling all 3 of the other boys. "It's alright with me. It's clear you both love him and don't want to harm him in any way."

"Yay!" Ouma yelled, pulling Rantarou into an abrupt and aggressive hug. Once it was over, he wrapped his arms around both (y/n) and Saihara happily.

"Thank you, Amami-kun," Saihara bowed slightly after the hug had subsided. Rantarou stood up and patted the shorter boy on the head.

"Of course. You better not break my little brother's heart, though. You won't like what'll happen to you if you do."

"Brother! Knock it off!" (Y/n) yelled. Rantarou chuckled at his anger, eventually giving his little brother a hug of his own.

"I'm just looking out for you, ya know?" Rantarou admitted. "It's because I love you, bro."

"I love you too, bro," (y/n) mumbled almost inaudibly. "But I can easily admit that I love Ouma and Saihara too."

"Don't let me stop you," He ordered. "Just remember to use protection when the time comes, ok? I don't want you getting hurt-"

"Knock it off!" Ouma yelled, interrupting the heartfelt moment. Rantarou waved as the trio exited the dorm, leaving him to enjoy his book in complete silence.

He chuckled softly as his fingers grazed the pages of the book. Strangely, he began to think out loud. "Those boys... care about him just as much as I do. I'm happy he's found some people just as amazing as he is."

((I'm not sure if this was what you've wanted, but I enjoyed writing this! To everyone else who has requested, I'll get to you all soon! Thank you!))