The most dangerous form of crush.
Jim: Oh no, here comes Susan.
Fred: Dude, what's up?
Jim: She's hot as hell, super cute and when i see her i can't decide whether to talk to her for hours or do dirty things to her for hours.
Fred: Dude, you have a love-crush on her.
Jim: Shit, that sounds serious.
Fred: It is man. Basically you're screwed.