Sukuna slices one of his servants for burning your birthday cake, he didn't really celebrate birthdays..but..you was an exception

"I demand you all to clean this up at once!" He yells in an livid tone before walking past them down the hall with a gift box

He opens the door to your room, you're not really expecting the King to walk in...

"Happy birthday." He says with a stoic expression, and nonchalant tone, as if he didn't care..when he really did. Yet he never shown it