Dima Matveev

You are Oleg Sheps's sister.

You're a very shy and reserved girl (Oleg knows this very well), but you love magic. Oleg is about 4 years older than you. (Dima is a year older than Oleg, so Dima was 5 years older than you.)

Sasha moved out from your place a year ago.

on topic:
That day, Oleg comes home with Dima. You don't know Dima. You're sitting in the room, wanting to meet Oleg, but you hear a strange voice, so you message Oleg in private.
-Hello, come into my room, please.