It was cold. And dark. And cold. He didn't like Winter. Long, long dark nights. Freezing cold, getting into his bones, making them ache, even more where he had broken them. Old wounds from foes, haunting him still.
You described the winter’s weather excellently. I could imagine the cold, dark, freezy winter’s night and Bruce in it so well.

But then there was trouble getting into Gotham, at night, without leaving traces that would declare to all 'Batman is Bruce Wayne!'.
That was perfect! I admit, I’ve never realized this. But you are right about the traces.

Spending long mornings in bed with Clark. Either just sleeping, holding one another and speaking about everything and nothing, or making love. Clark was always wonderfully warm due to excess solar energy from his cells.
AWWWWWWW! Clark brightening up the winter days for Bruce and warming him up after he returned home - that was so amazing!

I loved that! Thank you for sharing this wonderful story! :)