Welcome to the forum Ilycoffe
It's good to see that you've come through the tunnel, so-to-speak, concerning your eating disorder. Oddly my hairdresser often discusses what set her on that same track and how it has really mucked up her body and life...so, I was pleased to read that you are steering away from the obsessive calorie count etc. The way I do my "calories" was in working out what made up the amount that would represent a basic meal. So, 2 slices of bread with a filling etc would be ideal midday meal...and no counting involved. As I exercised I'd get ravenous, even with the 6 meals a day, so I upped it to 9 at one point...and I mainly just listen to my system, so if it wants food, in addition to the basic meals, I just go ahead and eat to satisfy. It seems to work for me.
Anyway, to the question of boobs

Don't worry, apart from the underlying muscle tissue which can be aesthetically enhanced with incline bench press and ordinary bench press (no need for decline for us females due to the anatomy of that breast area), the breast consists of glands, fatty tissue etc...so a bit of weight gain should see the breasts fill out a bit. I dropped a couple of cup sizes, now since I stopped exercise they've gone up in size again, so I'm looking to reverse that a bit by getting back to my routine fully.
Hope that helped a bit.