Dating him was like a dream come true, you've had a crush on him since first year, during seventh year you somehow got his attention but you really didn't want anyone to know about your relationship. So he didn't tell anyone, even his best friends.
He treated you right, which was an odd sight considering he was a pure-blood but not like you were complaining right? You two always snuck out to meet up after school and thanks to the Marauders map you guys never got caught, but one night while you two were making out, you guys were caught by Professor Dumbledore but he said he wouldn't tell anyone and indeed he didn't tell anyone.
His friends always suspected him or teased him by saying things like 'You must've gotten lycanthropy' or 'Padfoot's found himself a Padpalm' which Sirius responded with a simple chuckle, not denying or confirming it just calling the nickname 'Padpalm' horrible.
Soon, you two graduated and when the 1st wizarding war arose, he decided to break up with you to keep you safe. You didn't know what to think, you were pregnant and was thinking of suprising but now he was gone like this?? But later you've heard he's murdered 12 muggles and 1 wizard, his friend Peter Pettigrew which you didn't believe. But you went on with life, had your son (January 30th, 1981).
During the second wizarding war, you decided to join the Order of the Phoenix so you could help others, and not stay hidden and protected behind some people. One day, you were at the Order of the Phoenix HQ with your son, when your son bumped into someone and when you looked up to see who he bumped into, you were shocked to see your ex-boyfriend and also the father of your child.
"Sirius??"
You exclaim as you get up from the table.
"W-what-? What are you doing here?? Who is this child? What is the meaning of this??"
He says, clearly flustered at seeing you here but all you knew was that you felt bad for poor Mrs. Weasley who got stuck between you two, looking utterly confused. Blinking slowly.