I'd start complimenting her in messed up ways.

Tell her:
she has nice, broad shoulders like Jerome Bettis.
you think it's cool that she's being natural and letting herself go now that the relationship is getting older.

Start playing mind games like ... go out to McDonalds, let her order first, then order the exact same thing. Pace yourself and make her finish first .... only eat half your meal and say, "i'm stuffed, how'd you eat all of that?"