Boyfriend Scenario: You're Being Cute

                                    

                                          
Raphael:
Raph will react one of two ways if he sees you doing something he thinks is cute. He'll turn into a tsundere. OR. He'll be smug as hell. There is no in between. It's either he's telling you to cut it out, or he's teasing you for being cute.
The #1 thing that Raph finds cute is your grumpy face. To him you just look all pouty. So he'll just look away from you and tell you to quit making that 'dumb' face. But most likely, he's gonna squish your face while teasing you some before ruffling your hair. He gets flustered y'all. Don't let this shortie fool you. Tease him back. He won't be so smug afterwards. Of course that just ends up with him throwing you over his shoulder and taking you somewhere so he can cuddle you. While being angry at you for being so cute of course.
Leonardo:
Leo will give you the dorkiest smile ever if he sees you doing something he finds cute. No doubt he will tease, not as bad as Raph, but he will still tease. He can't help it. He's most likely going to tell you how cute you are just to get a reaction out of you. Which he thinks is even cuter.
The #1 thing he finds cute is when you try to train or practice using his katanas. Seeing how focused and determined you are just gets his heart racing. He'll come up behind you and grab you by the shoulders, offering to help you. Sly isn't he? He just wants to be closer to you. He gets all giddy when you complete a move correctly and get all excited. He loves how you hop up and down, asking him how you do. It makes him feel a sense of pride that you look to him for approval. Not to mention, you make him wanna spoil you to death.
Donatello:
Oh boy. This goof finds you cute a lot of the time. He's smitten with you. He would probably say how everything you do is cute to be honest. He's one lovestruck puppy for sure. He'll be staring at you with hearts in his eyes.
The #1 thing he finds cute is your curiosity. You'll always be so intrigued whenever he's rambling on about anything scientific or technological. You get a sparkle in your eye that just has him swooning and gets him lost for words. He thinks you're so cute when you plead and whine for him to tell you more. He's unused to getting attention like this since no one really wants to hear about science from him. He loves you so much. He appreciates how you listen, and that you genuinely want to hear me. It's even cuter to him when you wanna try to help him with testing chemicals or working on building something.
Michelangelo:
Oh where do I begin with this boy? He will squeal. He will hug you. He will smother you in affection if he sees you doing anything he thinks is cute. He just loves to tell you how cute you are too. He says it everyday to you. Even if you're doing something so random, he'll just give you a wistful sigh and tell you how cute you are.
The #1 thing he finds cute is how happy you get when you're eating. Seeing how much you love the food, especially when he cooked it, gets him energized. He'll get all happy and just hug the daylights out of you. He'll probably offer to feed you, not able to get enough of how much you enjoy the food. Since he's a food lover as well, he gets what you're feeling. He's glad to see you feeling good because of a meal. It makes him feel good. He will give you kisses. Without shame right in front of his brothers. He's too distracted by how cute you're being.