I think the seme have the same powers and can see that the bottom also have rainbow rays

Why do you say so? I'm sorry if I sound mean but I'm not

I think there was this panel while doing dem sex where hongyeon's eyes were showing rainbow colors when he was looking at taejun so at most ur right

I just read the next chapter of the raws and at the last panel it showed uke with a rainbow aura so you might be right