Day 1

Instead of running away when he was 16yo Sirius was forced to move to private character training school in France. He had to cut off contact with all his friends and break up with his boyfriend Remus Lupin.
Years went by and many have changed. Sirius presented omega.
A year after he finally cut off his family he started texting random numbers out of boredom not knowing that he will fall in love once again.