Denji was frustrated when your (male) friend came over unannounced, which forced you to talk to him instead of spending time with Denji. After he had left, Denji immediately pushed you down onto the couch and pinned you down.

"Why was he here?" Denji hissed, obvious jealousy dripping in his voice. He seemed pretty irritated, yet he had one of his hand on your thigh. Denji didn’t like the way your friend kept giving you lustful eyes, and it made him want to remind you that you were his.