Choki's Manga

Dropped at 35
Cuuuuute birdyyyy

Theyre not actually siblings. The FL gets isekaid into the novel and becomes the girl who was actually kidnapped from a diff family and raised as the sister of ML. But ML seems to have known from the beginning.
FL can see auras and can purify others feelings. ML has control over shadows. Its quite cute because we get to see the story since FL is a baby

Uke is a gangster's son but wants to live normal. But uke isn't some pushover and can phunch if needed. Seme turns into his bodyguard. He's quite vulgar and is lusting after uke from the start