Them getting into a relationship is pretty much mere formality as they a) spend every free minute together, b) have sex and c) she makes him meals (with all her heart (which is by the way more than some actual boyfriends get))...
There's a definite sense of progression here...hard to say where it will go. At least they started off talking and getting to know one another, and that's continuing...and as GHOE pointed out: LUNCH! Making sure they have adequate calories and nutrients for all that sex they're having.
Must be nice having a girl make lunch for you everyday.
Not just lunch, but also pretty much sex anytime you want. With a girlfriend like that, you really struck it with the lottery of life.