Reigen Arataka
Now, Reigen is a sneaky, sly, composed man. You'd think he'd be the one making you blush all the time, right? Well, for the most part that is true. Not just anything will fluster this business man. But if you manage to catch him off guard, you'll be surprised by how red he can get.

"Arataka?" You sung, stepping inside of his official with a nicely wrapped up box in resting in your hand.

Reigen was snapped out of his work rush and removed his eyes from his computer. "Hey," he greeted with a confused but pleasant smile. "what are you doing here?" He rolled his chair back from his desk.

"You didn't take the bento I made for you today, so I came by to drop it off." You hummed, walking over to his desk and placed the box next to his computer. Reigen's heart tensed, you were so kind to make him food but even more- you took time out of your day to bring it to him!

"Oh uh- thank you." He glanced at the pink box. Something he'd be glad to show off to any clients who questioned his girly taste, 'Oh this? Yeah, my girlfriend made me lunch today.' Is something he imagined he'd say.

You stepped around his desk and stood next to him. This prompted him to get up and thank you more formally. "I really appreciate it." He continued.

You cleared your throat and placed your hands on Reigen's shoulders. "Maybe you could come home early today?" Your hands slid to his tie and tightened it. "I miss you."

Reigen placed his hand over his mouth and cheeks, looking away. He knew what your game was. "You know I have clients to take care of," his voice was muffled, "sorry."

"Please?" You pushed further, also lightening the tone of your voice. Your dainty hands slid down his tie with a tight grip. He stuttered your name a few times in an attempt to stop you. He grasped onto your hands to avoid them 'slipping' down any further. 

"You know I'd love to- but-" You sighed, no matter how much you tried to seduce Reigen you wouldn't get him out of his darned office.

"Alright, but don't stay too late. I'll be waiting for you at your apartment. Okay?" Reigen nodded his head a little too eagerly. You smiled and swiftly gave him a little peck on the lips. 

After that, you left and the rest of the day consisted of Reigen staring at your bento box with flushed cheeks.

Teruki Hanazawa
Teru is similar to Reigen in the way that he's pretty composed when it comes to the relationship. There's only been a few very specific times when you were able to get the blonde boy red-faced.

"Would you like to be my boyfriend?" You suddenly suggested. Teruki visibly jumped at this, startling you too. You and Teruki had been sitting at the school roof-top chatting calmly with one another for some time now, a comfortable silence fell upon the both of you. Then- well you broke it with the big question.

"P-Pardon?" The blonde struggled to compose himself. 

"Sorry! Was this a strange time to ask? It's okay if you're not ready to give me an answer! I just thought that-"

"No, no. It's fine." He placed a hand on your shoulder, stopping you from rambling on too much. "It was just surprised, that's all." he chuckled airlessly. His collective response calmed you down a little bit, at least he wasn't saying no.

"You're blushing." You pointed out. Teruki blinked once, and placed his hand on his cheek.

"I guess I am." He once again laughed at the situation. "You are too."

"Oh." Your hands smacked against your face, and you felt your overheated cheeks. He was correct.

"That was really surprising, I didn't expect you to ask me." He looked forward and away from you. 

"Sorry," you smiled nervously "I was just a bit tired of waiting for you." 

He often get's flustered if you take charge in the relationship, he thinks it's cute asf.

Ritsu Kageyama

Ritsu may be a deadpanned boy a lot, but deep down he's really a tsundere in disguise and we all know it. Too many compliments and he's gone (but you gotta be careful about what you compliment him on!).

"Ritsu! You're so smart." You gawked at his 95% test results. "I didn't know you excelled so much in science."

"It's nothing really, I just spend a lot of time studying, that's all." He brushed it off.

"Hey Ritsu! Your hair is extra spiked today! It looks good." You grinned.

"Oh? Thanks, I put in extra gel today."

"Ritsu, you have such a nice smile. Smile more often for me please!" You placed your fingers at each end of your mouth, pulling your smirk into a toothy grin.

"Sure."

"Wow Ritsu! Your physic powers are so cool!"

"Ritsu! You're so strong!"

"Ritsu you're such a kind person!"

"Ritsu! Ritsu! Ritsu!"

The poor boy will probably die, too much verbal affection and he'll be bent over grasping at his chest with cheeks so red you'd think he was possessed by dimple. 

Shigeo Kageyama

Mob is very similar to Ritsu when it comes to blushing. He is very easily flustered, no doubt about it, so usually you need to be careful when showing your affection to him otherwise you might end up boosting his percentage.

"Hey, Mob."

In response, he turned his head to face you with a blank and cute expression staining his face.

"Would you like to kiss?" It was a simple question, but it held so much meaning and value behind it that Shigeo could barely form a thought let alone a sentence to respond with. His face suddenly flushed with the colour red. "O-Oh!" Your eyes widened at his reaction. "Mob? Shigeo?? Are you okay?" Your hands cupped his cheeks and you shook him a bit, trying to pry out a response.

"U-Uhm- well,,," 

If Dimple was around, he could've easily possessed Mob in a second, since his soul had practically left his body. 

Shou Suzuki
Shou is another hard one, he considers himself pretty much the dominant one in the relationship, so it'll be hard to make him blush.

"Good morning, Shou." You greeted with a wide and drawn out yawn.

"Good morning sleepy head. How did you sleep? I-" Once Shou actually turned his head to face you, he was able to see you in all your sleepy glory. Messy hair, red face and half open eyes, but most importantly- you were wearing his jacket.

"Good. Your bed is really comfy."

It would take a moment for Shou to process your words, mostly because he was way focused on how cute you looked in his bulky jacket. He shook away the red that was forming on his cheeks and stood up. "Nice jacket. I wonder where you got it from."

"Hehe, you caught me." You lazily grinned.

"You should wear more of my stuff, it suits you."

Dimple
I'm sorry everyone, but Dimple would never. I mean, he has full control over his little skin suit, there's no way he'd slip up and actually blush. It doesn't matter if you try to be cute, sexy, seductive- nothing works!

There may be a slight chance he'll get red in the face if ever he's being a pervert and checking you out. But he's at least got some manners, so it would be unlikely.