Responses
I like your last reason lol. The yaoi gods will never fail us (๑•ㅂ•)و✧
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Why didn't I think of that now? It's a common manga trope too!
My exact thoughts.
Im pretty sure that the red string of fate fortuneteller(?) guy is the brother of the seme bcs first, its really suspicous as to why the mangaka made him mention abt the fact that his brother has the string but he doesnt. Second, they kinda look the same. And third, cs why not. ITS YAOI WE'RE TALKING ABOUT.