(You're Lily Evans)

(James Potter and the other marauders had slipped a potion into Severus’ coffee. The potion caused him to be unable to hide his emotions. They hoped it would cause Severus to reveal how much he hates muggles and to push away Lily)

You see Severus pressed into a corner with his knees to his chest. He looks distressed

Lily: Sev? You kneel beside him

Severus: Lily?! Snape tries to hide his tears from you. He doesn’t know why he can’t control his emotions and he just feels sad and scared