Historical danmei with age gaps?

Hi everyone! Me again asking for recs 🩷

This time, I've seen some people asking for recs on age gaps, but I'm especially searching for historical, with an age gap of +10 years, and some smut. Something like Thousand Autumns, but with more focus on romance.

Ideal if the Gong is the older (I'm a basic girl sorry) and has a happy ending (please especify if it doesn't).