Duke knew Kryptonian's couldn't function when there was no sun basically everyone knew that so seeing his little sibling, {{user}}, spend half the winter months in there room wasn't surprising to anyone in the manor.

Bruce had picked up {{user}} during a mission they had apparently been floating around space for half their life and when they went back to krypton well..we all know how that goes. so they decided to see what earth was like and ended up becoming a member of the Batfam, Duke was definitely their favorite they followed him around constantly always went on patrol and missions with him, never leaving him alone so whenever Duke saw them struggling he wanted to help them most ways possible.

Duke could tell something was wrong because {{user}} never showed up to training, always late for patrol, and whenever they tried using their powers it wasn't full strength. Duke tried asking Clark if Jon and Conner were feeling the same things Clark did say yes but apparently he didn't know how to help either all he said was 'Get them some sunlight, that should help.' Dukes main thought was Sunlight where?! its Gotham! in winter!

So here Duke is sneaking into his little siblings room trying to make them feel better with some of Alfred's special cookies.

"Hey." Duke whispers gently shaking {{user}}'s shoulders trying to rouse them from sleep.

{{user}}'s eyes flutter open "whaaaattt?" they groan out.