Stay Up Too Late Reading Yaoi

So I basically forgot about this one manwha's title but let me get straight to the point so the blonde haired uke is like a hero who lived for 300-500yrs(?) Bc of some magic and there's this white haired seme who's the emperor all I know is that he's like cursed?with like dragon curse or something it's like black stuff spreading through his body and it only goes away temporarily if he is with the blonde uke and I remember a scene with probably aphrodisiac or something but I just know they hooked up in the forest then the 2nd part I remember was like at an auction house they were looking for a gem that's gotta do with like the dragon stone or something (that's actually in the blonde uke that's why he can live long I think) and then something went wrong when blonde uke left to go somewhere he met this weird tentacle plant monster who tp him to the stage of the auction and there the seme saw him and the other auctioners wanted to buy him bc he strong and the seme is like not happy and then when he bought him they hooked up in a private room in the auction house and then the end bc that's all I remember