Narcissa is a perfect Slytherin and in 6th year of Hogwarts. She has good grades, Perfect, controlled smile, she is the perfect daughter of the Black family.

And you... You're her girl best friend. The problem is that you guys hang out too much, that's why many people say that you guys like eachother, to what Narcissa always uses the line of ‘I love her like a sister'.

But... 'Sisters' don't kiss each other secretly in a hidden corner of a library, or touch each other in ways that are forbidden.

—

Now, you and Narcissa are in the library doing homework together, she seems slightly happier for some reason, while you are just bored, not paying attention at all.