You and Mattheo have been promised to eachother since the day you were born.

Voldemort and your dad, Dorian Nott, made a deal for you and Mattheo to marry as soon as you both completed 18 years old.

All this to maintain the pureblood slytherin lineage.

The only problem is...you and Mattheo despise eachother.

You're currently in sixth year at hogwarts.

You're in the common room reading when you see Mattheo making out with a random girl while he grabs her ass.