7:30 a.m | Classroom 1-B

The Couples Of The Round Table were having a meeting to stop all the plans. Shouji had dropped out of the table not caring anymore. They only had four people so they couldn't really follow everyone. Or could they. Midoriya would probably stick to Todoroki and Momo would probably be hanging with Kendo. So that decided it. Uraraka would be following Mina, Iida would be following Bakugou, Ibara would be following Momo and Kendo, and Monoma would be following Midoriya and Todoroki. The plan was set. When school started at 8:30, they would begin their spy mission. 

8:30 a.m | Mission Start!

The Couples Of The Round Table began following their designated people. Uraraka was sneakily floating on top of Mina who was sneaking up on Kaminari, Shinso and Awase. Mina then proceeded to push Shinso into Awase knowing Awase was dating Momo. She really hoped this would succeed is her first mission but nOoOoOo, Uraraka had to drop down between them and push them away. Bakugou was exploding his was towards Kirishima and Sero in the cafeteria with Iida hot on his trail. As much as Bakugou hated to purposely make Kirishima cheat on him, he had to overthrow the Couples Of The Round Table. He pushed Sero into Kirishima but Iida was too fast. He sped between them making odd hand motions and screaming. Everyone stared at Iida. Bakugou laughed out loud and left. Ibara was following Momo and Kendo in the courtyard who were heading towards Toruu and Tsuyu. Momo and Kendo both went behind one of them and pushed them together. Shiozaki created a large wall of vine-y hair to protect her virginity. Momo and Kendo were practically crying. Midoriya and Todoroki were walking holding hands with Monoma following them. They walked until they saw Tetsutetsu and Ojiro drinking water after training with each other. As soon as they finished their bottles of water, Midoriya and Todoroki pushed them into each other. Monoma jumped out of his hiding spot behind a bus, copied Todoroki's quirk, then made an ice wall in between them. Little did The Couples Of The Round Table know, The Cheaters Of The Round Table knew they were following them, and they had a whole other plan. 

8:00 a.m | The Holiday Lounge

Once everyone was back in the room, the second and third years and teachers kicked out the first years and Midnight(for raising such failures) and started their meeting. Midoriya knew Monoma's personality and knew that he would send people to follow them. But they wouldn't send people to follow the second years. So the third years would be providing distractions such as attempting to make two people(who aren't together) kiss but miserably failing on purpose. The second years would stay away from The Cheaters Of The Round Table and force others to cheat on their partners. They agreed and walked out. They were wary of The Couples Of The Round Table seeing the second years so Fudoki created a portal and the second years left the room. 

11:50 a.m | U.A

The second years went around cheating on their partners, making other people cheat on their partners, and forcing people to cheat on their partners. They were having the time of their lives. Plus, no one could be mad at them. they were just innocent second years. 

12:00 p.m | Cafeteria

The Cheaters Of The round table were gathering the members of The Couples Of The Round Table and ushering them into the Lunch Rush's Eatery. Bakugou wasn't there but that's in another paragraph. After The Cheaters Of The Round Table brought their rival Table to the Eatery, they saw a line of second and third years. THey weren't with their partners though. They were randomly scattered. Getting ready to keep the tradition of "Cheat on your partner day" going.

12:01 p.m | Cafeteria

The Cheaters Of The Round Table were happy to see their plan working. The Couples Of The Round Table were shocked. Even more so when they all kissed random people. Especially when everyone kissed someone random. The tradition was going to be continued because The Cheaters Of The Round Table won the bet! They all made their way to their old 1-A classroom for a surprise for a certain angry Pomeranian. 

Time rewind to 11:30 a.m | Someplace in Japan

The self-appointed "Bakusquad" was distracting Bakugou - and trying not to die in the process. They brought him over to a cafe after he did his job of distracting Iida. They appointed for his boyfriend, Kirishima, to stay with him while they planned a surprise with the rest of the class(mainly because Bakugou wouldn't dare kill him). Kirishima and Bakugou walked to a nearby park and Bakugou climbed into a tree and sat in it motioning to Kirishima to do the same. They sat in the tree and hugged, talked and played phone games. Not once did Kirishima mention Bakugou's birthday and that upset him. Bakugou felt as if he forgot and felt lonely the entire time, wondering if he really were so insignificant in his boyfriend's life for him to forget about his birthday. He snapped out of his thought when Kirishima's phone rang. Kirishima jumped out of the tree and took the call. Bakugou couldn't hear a thing. Kirishima called Bakugou down from the tree saying they were going back. Bakugou jumped out of the tree an he and Kirishima walked away together, holding hands.

12:30 p.m | Old 1-A Classroom

Class 3-A (excluding Bakugou and Kirishima) walked to their old class 1-A classroom. It brought back so many good memories it was nostalgic. They were setting up for Bakugou's surprise birthday party. Class 3-A, the teachers and Kishi and Yukio were invited. Bakugou got along well with Kishi, and Yukio was there so Kishi wouldn't be lonely. Class 3-A was there because, well, they were classmates for 3 years so it's only fair. Aoyama, Mina, Tsu, Sero, Iida and Uraraka were on decorating duty. Jiro, Kaminari, Ojiro, Shinso and Tokoyami were on Entertainment duty. Todoroki, Sato, and Koda were on food duty. Midoriya was on supervising duty and Yaoyorozu was on Creating duty. Basically creating supplies for everyone. By 1:30, everything was perfect and Kaminari called Kirishima telling them that he could bring Bakugou back now.

2:00 p.m | Old 1-A Classroom

Bakugou and Kirishima were in front of the door to the Class 1-A classroom. "Why are we back here? It brings back so many memories..." Bakugou muttered. Kirishima laughed. "Since when were you so calm and rational? I thought you were more like... SHINE SHINE SHINE!(If you know where that's from then... I'm proud)". "Shut up Shitty hair!" Bakugou whined."That was three years ago at the beginning of the year!" Kirishima laughed even harder at this, remembering all their memories together." Let's go in shall we?" Kirishima said motioning at the door. Bakugou groaned but opened it anyway. 

"SURPRISE! HAPPY BIRTHDAY!!"

2:10 p.m | Old 1-A Classroom

"SURPRISE! HAPPY BIRTHDAY!!"

Bakugou was shocked that they had remembered. He was almost in tears seeing the classroom. Everything was set up as they were three years ago. Their desks, that one sink in the corner that Aizawa accidentally turned on and flooded the school (This is referenced from one of my other books), Aizawa's desk, the board, the podium, the cupboard, and even Aizawa, who was sleeping peacefully in his sleeping bag behind the podium. Only one thing was different (apart from all the streamers and food on the desks). There were pictures taped along the walls of the classroom with Sero's tape. They showed all the good memories that had been made at U.A. 

Bakugou had thought that they had all forgotten his birthday. Even if he was a spiky hedgehog, he was a lovable hedgehog. They partied until sunrise, and that was a wrap to the exclusive U.A holiday, Cheat on your partner day.

A/N

Hello to everyone who has read this! I was originally planning to end it at 12:00 p.m | Cafeteria, but I accidentally picked the day of Bakugou's birthday. @BlitzyWolf told me in a comment and I legit felt like a failure for not knowing one of my favourite character's birthdays! LIKE WHO DO I THINK I AM!? Anyways, next oneshot will possibly be of Aizawa x Oc. So uh- Look forward to it? Once again, another huge thanks to BlitzyWolf for telling me about Bakugou's birthday so I no longer feel like a failure :D
See ya'll next oneshot!