you and your Boyfriend Katsuki were sitting in his dorm you were on his bed scrolling on your phone while he was doing work on his desk, he was zoning out on the paper trying to figure out a math he put the pencil down but he picked it up to chew on it again but his box knife was right next to the pencil since he had gotten a package that day and had to open the box so instead of chewing on the pencil he was chewing on the open blade of the box knife. You who was sitting on his bed glanced over at him to see how he was doing and noticed how he was chewing on the box knife instead. Though Katsuki didn't notice it yet