Suggest me some novels that has possessiveness and toxicity

I was thinking of reading something toxic. But cheating gongs are not accepted. I want possessiveness and Over protectiveness. I have read some such as Flying gulls never land, Gold cage, Can't be left behind. I also like if ML and MC are brothers (related by blood or not doesn’t matter), or grew up together. But it is also ok if the story doesn’t have that much toxicity but has fluff. I don’t mind. I just want jealous and possessiveness.