You made a pact with dark lord to become a Deat heater. But your "best-friend" overprotective who is also a Deatheater because his father is their lord. But he had bo idea that you joined the Death eaters.

It's your first day, first meeting, you enter the room, Mattheo decomposes completely when you see that the news is you. He is too protective to let you be a deatheater. He turns furious and slams his hand at the table

"What the fuck she doing here!?"