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Mina honestly didn't mean to even find out about Katsuki's and Momo's relationship.
She was at the mall for a different reason but when she had gotten sidetracked when she had seen Katsuki with Momo. What are they doing here together? Mina didn't piece it together at the time because she knew that the two teens were friends, which was odd enough but nothing was odd for Class 1-A.
Mina watched them as she found them more interesting than the food she was eating. She then boxed up her food and she started to follow the two. As she followed the two, she noticed that Katsuki went into every store that Momo had even looked at and that shocked the hell out of Mina. Katsuki has never done that before! She thought in shock as she watched as Momo would beg Katsuki not to get her anything but he would just politely tell her to fuck off. Mina was close to hear them talking to each other. "Katsuki, you don't have to get me anything from here." Momo told the explosive teen but the young man turned towards her with an annoyed look on his face but inwardly he was proud of himself. He knows that Momo loves teashops but he knew that she loved him more.
Mina was floored when Katsuki's arms went around Momo's waist to pull her closer towards her. "You're my girl, Ponytail." He said as if that was the most obvious thing in the world. Are they-?! Her thought started.
"I know that, but you spending too much and-." Katsuki cupped Momo's cheek with a slightly rough hand.
"I'm not going to repeat this, Momo." Mina was floored once again. "You are my girl. It's my job to spoil you." Katsuki gave Momo a very soft smile and the girl blushed at her boyfriend's words.
That was when Mina's brain decided to finally rewire itself. They are! They are dating! She thought in shock and happiness for the two teens. It didn't seem too out of the way for them to be dating but Mina knew she would be lying if the situation didn't strike her as odd as Katsuki had never expressed an interest in the girl whenever they talked about their classmates. Mina gasped when she realized something. Is it because no one knows that they're dating? The entire class knows that Katsuki sees her a friend but only I know that they're together. She thought as she smiled at the cute couple.
Because the two had never told the class that they were dating yet, Mina kept it to herself as she knew that it wasn't her secret to tell, although Katsuki did corner her later to talk about her seeing him with Momo. "Relax, Katsuki. It doesn't matter who you date." She simply shrugged her shoulders at Katsuki threatening her to not tell and her words floored him. Huh? He thought.
"You really won't say any fucking thing?" He asked her again and Mina huffed at him.
"Of course not! Again, that's y'all jobs if you want the others to know. By the way, you socked that guy's jaw really good." Mina complimented Katsuki on punching a guy that was trying to flirt with Momo even after she had told him that she was taken.
"That asshole was messing with Ponytail." Katsuki blushed at Mina's words and the girl shook her head.
"You love YaoMomo. That's nothing to be ashamed of." She tells him.
"Shut up, Pinky. Anyway, before you fucking ask, I'm a model." Katsuki immediately tells Mina.
"What the fuck?" She was floored by his job. "Wow!" She was then amazed.
Katsuki shrugged his shoulders.
"It's whatever, you dork. Anyway, don't bother me. Tell the others I fell asleep early or something." Katsuki tells Mina and the girl saluted him.
"Of course. Tell Momo I said hi." She tells him and he waved her off but Mina giggled after him, knowing that he will tell her.
Soon, Katsuki was with Momo and he was hugging Momo as they were cuddling on her bed. "I still can't fucking believe that you brought your bed from your house." Katsuki told her and his words made Momo blushed.
"I was hasty. I admit that." Momo quickly spoke to defend herself but Katsuki shut her up with a gentle kiss to her lips.
"Don't lie to me, Ponytail. You get homesick, don't you?" He asked her and Momo looked down.
"Doesn't everyone?" She asked and Katsuki huffed.
"But you worst of all. You were homeschooled, Ponytail. All you knew before U.A. was home." Katsuki wasn't mocking nor judging her. He was telling her.
"That's true." She spoke as she hugged Katsuki. Katsuki hugged her back as he started to understand that being with him made Momo much more happier because when she was at U.A. with him and their other friends, she was free.
He knew that having friends that cared about and with him being her boyfriend, she was going to grow more confident and Katsuki can see that she is going through personal changes and he had to say that he loved what Momo was doing.
"I love you, Momo." He said after a while of just staring at her beautiful face.
"I love you too." She responded as she softly grinned at him.