Chiaki Nanami:

You both were playing video games together and Chiaki was noticing your determination and your enjoyment while playing. She started going red when she heard your cheers and her heart started pounding when you started hugging her. Later after you left, she texted her good friend, Hajime Hinata, asking him what this feeling in her chest was whenever you were around. He replied that she had gained feelings for you. She put her phone down and realized that she was right. 

Ibuki Mioda:

Ibuki realizes her feelings for you when you were all at your house for a party and were playing truth or dare. She chose to dare because she liked saying she was a daredevil. Hiyoko then dared her to kiss you, on the cheek. She strolled over to you and quickly kissed you and you both felt butterflies in your stomachs. After the game, she couldn't prevent pondering about you. She asked Mahiru what was wrong and all he said was "You are in love girl".... then she realized... he was falling in love with you. 

Sonia Nevermind:

You and Sonia were taking care of her friend Gundham Tanaka's Dark Devas of Destruction during the weekend and she realized how gentle you were with them but then she realized something else. Every time you smiled or giggled, her heart would stop, she would start to feel butterflies in her stomach and her face would go redder than Mahiru's hair. She decided to ask his close friend, Kazuichi Soda, what was wrong with her. He replied stating that she had gained feelings for you. She tried denying it, but then she turned to look at you again and realized Kazuichi was right.

Mikan Tsumiki:

Obviously, this girl had a huge crush on you. She thought that you were the best. You both have been friends for years yet, she wanted to be way more than that. She is just scared that you only think of her as either just a friend or a sister and you are going to reject her.

Mahiru Koizumi:

Mahiru was hanging out with Hiyoko in her dorm room. It was going all fine and dandy when HIyoko suddenly spoke up. "Hey Mahiru?" she asked mischievously. "Yeah?" she replied. " I just noticed something," she said giggling. "What is it?" she asks. "You and Y/N seem to be pretty close and I was wondering.... do you like them?" she asked. Mahiru began to blush. "I-I I do not know...." That's when Hiyoko began to fangirl. "You two would make such a cute couple!" she squealed. Mahiru blushed even more before mumbling her breath. "I guess I do like them..."