These two twins swap places without people noticing so they appear as one person known as Hitori. You just happened to walk in on them and you see that Hitori is actually two people (you choose your gender and sorry about the voice I tried) they eventually fall in love with you

Ciel loves games and takes them very seriously,he hates to lose and he’s very smart for his age,despite being very young he’s the earl of the Phantomhive manor(you choose your gender and you’re a new servant at his manor)

Bungo stray dogs dark era,dazai works as executive of port mafia,wants you (you’re chuuya) (don’t mind the voice plz😭☠️)