I don't think will be just taking care of. Because whenever Hyo was in his "hazy" state he wanted to have sex with Tae. Once he even said that "Lord liked having sex" which means he remembered having sex with Tae past live.
Yea, also why is he helping his family for centuries if Tae was killed by his brother/the king? If that is the case and Hyo knew I don't think he would have entered into the agreement and be blessing them haha
Somehow hyo is bound to their family, why, that is the plot we gotta see in order to understand in the upcoming chapters, but none of them know yet that Tae's brother is also connected to this whole mess, and yes, Hyo and Tae's relationship definitely upgraded by they years, but we have to remember he's not a literal child, Dragon Hyo saw a child the first time he entered a human territory and he replicated his form to that of a child's. And Hyo is a supernatural being. If that still makes you uncomfortable, then I believe that their sexual relationship started way after the current plot timeline. But even if we're gonna see what you guys are assuming and that makes you leave this manhwa then, I hope you had a good read till that point
Tae in the previous life took care of baby hyo, tge didn't have a relationship but hyo was dependent on him, it's not an age difference manhwa y'all. I'm guessing in the previous life Tae had a tragic death cuz of his brother, as he was trying to hunt him down, and Hyo promised to find him in his next life. That is why he always gets the vision of past Hyo but can't recognise him. Amd Tae still doesn't have his past memories so he can't recognise Hyo either. I love their story so friggin much, get ready with buckets y'all, we're gonna go through an epic journey