a crush
A crush is when you like someone so much you think they're the best thing since sliced bread. But if you don't know them that well, it's just a little crush, like liking someone because they look good or they said something cool once.
I had a crush on my math teacher because she wore leg warmers and said 'math is fun' once.
My crush was my neighbor's dog because it stole my sandwich.
I thought my crush was my friend until I found out they had a crush on me too.