Hello….
Sirius Black was a prankster at heart. He loved to make jokes, and he definitely loved to see people laugh.
That turned out to be his downfall.
He absolutely should never have goaded his deranged cousin. He never should have taunted her. And he absolutely never should have tried to put himself in harm's way, forgetting about his lonely godson who had to face horrors he wasn't prepared for.
Of course, he did so anyway. He blames the adrenaline.
She was beautiful, even while casting curses and snarling like a lion (he knows she hates being compared to the Gryffindor mascot, and does so anyway). He remembers their childhood, she had long, curly jet-black hair and porcelain features. The large eyes framed with thick lashes would look coldly at anyone who dared talk to her, and everyone except for her family was insignificant. Unless it was her Dark Lord.
Her looks deteriorated while in Azkaban, but she was still beautiful. He would never admit it, but he would respect Bellatrix if she wasn't such a loyal follower of Voldemort. The sheer power she displayed when angry was incredible.
Anyways, he just wasn't expecting her to throw a curse that would do damage.
Okay, maybe.
But he was expecting an Unforgivable, probably Crucio, which was her favorite.
He instead got a curse that blasted him back onto the Veil of Death.
He would've liked to die with a couple of buxom blondes, preferably in bed.
And he was not expecting death by a bloody curtain.