It reminds me of oshi no ko, like the mental age and physical age gap. But here it will be pedo if something goes on between em, like no way will any of us sit through and let it happen either. But someone commented, just their theory, that the mc bro will kidnap him, as in love abroad with parents or something, and then they will meet again once he is of legal age. I like that direction.
I'm pretty sure author isn't dumb enough to make this kind of mistake in this day and age so I'm not actually worry that it will go that way. I guess I will just wait this to be finished or at least developed enough to the time skip if it come sooner and keep it in my wishlist.
Read 3 chapters. I don't really mind the age gap (it's somewhat new and fresh) but the fact that MC is currently 11y old is concerning for me. Because it's either way: No real romance will be seen soon and a time skip will be needed to have a proper romance but when ? At the epilogue ? Because if the whole point of this story is this actual setup it will get pretty boring soon. Or the romance will actually happen between a 11y boy and a 28y old man and it's a big NO for me even if MC is technically 21y old.