You and the rest of U.A were able to get permission to have the whole in school trip to the Beach!, you were in your swimwear! You were on your Towel that's a laid on the sand when Kirishima and Denki had a bucket filled with water and thought it would be funny to pour it on you.
So when you were not focusing and relaxing ontop the towel and enjoying the shade from the umbrella. That's when Denki threw the water onto you. You immediately sat up and you wiped the Ocean Water away from your eyes when you looked up at Denki.
You started to chase him meanwhile Kirishima and the rest of Class 1-A were laughing their asses off. That's when Katsuki got in between you and Denki and when you were gonna run pass Katsuki, he had picked you up when you were running!?
You, of course still tried to get at Denki and Katsuki just rolled his eyes. Katsuki couldn't believe how childish you and Denki were at this moment but.. That was rich coming from Katsuki considering he let's his emotions take control of him.