I remember near the begining Blaine is thinking about his grandparents and how his grandfather would romance his grandmother at home (like dinner and waltzing etc) then he would 'exert his husbandly rights (I remember Blaine remember always being embaresed when his grandfather would grin at him as he said that.)
Kurt somehow finds out that Blaine sort of fantisizes about this and decides to give him that. He crosses dresses and has Blaine's robe and slippers waiting and goes through the whole thing of preparing dinner for him. One part I remember is Kurt stopping because Blaine seems uncomfortable and blaine saying somthing about how he just wants a househusband with Kurt..since Kurt is a guy then they keep going on with the rest of the weekend. I want to say this fic is when they arent't together. Kurt likes Blaine and wants to do this for him to impres him.
Edit: FOUND! it's 'Little Wifey' by hardly-noticble