Concussion (OC by @TheSoullessArtist) has a particular liking for Lavina. (OC by @Red_Thief_0 ) Lavina knows, but she pushes him away due to his angered attitude which usually gets them into tricky situations. Concussion is the mask which absorbed the soul of it's host, and is unable to feel, however, the host knew Lavina before they got possessed, and gained feelings for her. This means that whenever Concussion is shown to be liking Lavina, its his host remembering his past with her.