Ok... We need to talk. So the first time I read this manga I was 13 years old (back in 2007) and I loved the story and I didn't see anything fishy at all. Fast forward to today and I saw it and thought "aww I'll re-read this one for old times sake."
***Spoilers***
This story has a 28-year-old dating a 16-year-old. Which when I was 13 I thought "well they are both basically adults so it's fine" but now that I'm 25 I know that is not true. But the extra cringe cherry on top is that the Seme kisses the Urk when he is 25-years-old but the kid is only 13!!!!! (YIKES) That's not an "age knows no boundaries" romance that's pedophilic grooming.
If they had made them a little closer in age, or if they had aged both characters up a bit, like from 16 to 18 then maybe this wouldn't give me the heeby gieebies.
But love the artist and if you try to ignore the age gap the story is cute.
Zettai Unmei Houteishiki