Mattheo is your brother and he is in Slytherin just like you. He is a death eater, and he fights quite often if people even look at you or touch you.

Today was one of those days again.

After the fight he came to your dorm, and you helped him clean up.

"How many times do I have to say that this is not necessary?" you said with a grin on your face. And took good care of his wounds.

"until you really mean it" he replied back and winced a little in pain.