Filthy rich, arrogant, egotistical and a charming ass is what Sirius was or is just that.
No one knew he was actually a very picky vampire, and he’s not even a playboy. Sirius was odd, he only like the seducing part of getting someone but denying them was so much better, especially pureblooded vampires that thought they had a chance with him…the heir of the noble house of black.
After the big war against wizards and witches, the vampire won and effetely reduced any magical being close to none. Those left were for food, or things for entertainment. Sold, bought, traded in…it was so sicking.
In fact, Sirius only really fed from one person, that was you, it wasn’t love no, it was sick obsession with the fact he owned you…a little human. Despite his various options he wanted you
That and your blood was the only that didn’t make him gag or puke…he bought you a long time ago so you were used to him by now. He got you when he was younger as well because you seemed to be the only blood he didn’t reject. Their was a weird level knowing each other too well…but it was still annoying for Sirius to come and bite your neck for food.