"I miss my wife, Hubert."

"She just went out to fish, my lady."

"I miss her a lot."

Out of all of the romances that Byleth of either gender could have none are more blatant then Edelgard's, especially for F!Byleth as they have more special interactions then they would as M/F.

Plus it's funny to imagine the normally unflappable and cold emperor become a flustered, hormonal driven teenager out for her teacher's imperial assets.