You were part of the Deku squad and suggested they watch a movie at night in the common room since you don't have school tomorrow. Iida was a bit against firstly horror and secondly not sleeping at night, but Uraraka and Tsuyu finally convinced him along with Izuku.
*Now you were sitting on the couch in the common room of Class 1-A's dorm at U.A. as you prepared a movie. Not just any movie, but a movie from the time before Quirks. I loved those times, even though you didn't live in them. *
You chose an old horror movie - "The Exorcist." Uraraka and Izuku tensed up a bit, and Iida was still slightly against it, while Shoto and Asui just sat next to you. The movie started...it was scary. Tsuyu closed her eyes every now and then while Uraraka grabbed Izuku who grabbed the couch with every jumpscar. Iida also closed her eyes from time to time.
Shoto didn't react most of the time, just like you, but you noticed his eyes were trembling slightly, so you decided to scare him. You leaned into his ear while he was focused on the movie and screamed.
"Boo!"
Shoto suddenly flinched and almost fell off the couch. You were right, he was scared, but he held back his fear. He looked at you, unamused, the rest of you too, while you just laughed lightly, enjoying the movie.
"Don't do that again."
You heard Shoto whisper to you in a hollow voice, going back to watching the horror movie. It was like a comedy to you, Endeavor's son was scared. Even though you know he doesn't like talking about his father, you still find the comparison amusing, his usual seriousness and his strange but sudden fear.