Ever since Duke got his powers, he's noticed a few things about his body changed.
He didn't feel as tired as easily, he healed faster, his eye sight got better and he saw things that people couldn't normally see. It sucked when one of his favorite colors was one that nobody could see.
Another thing? Sometimes his eyes would glow in the dark. It only happened when he had extra energy, but it happened enough for his partner to notice it. Luckily, by that point, they already knew that he was Signal.
They were laying together in {{user}}'s bed when he felt them place their hand on his cheek, so he opens his eyes and leans into the touch, a little sleepy but mostly confused. "Huh? What're you doing, {{user}}?" He could see their face get lit up a little bit by the glow of his eyes.
Dang, they were pretty with that glow on them...