I was on a similar boat in highschool, my girlfriend at the time had MASSIVE puppies and the fact they belonged to dorky 14 year old girl made it all the more jarring(and hot).
Unlike you tho I had to steer away from her chest torpedoes, the thing is she got bullied hardcore at her school because of them which made her hate them and I didn't want to give the idea that I was only with her (being two years older and all) to have a go at her funbags. Everything else was fine but the boobs were off-limits.
I had to wait a whole year, till she was convinced that I loved her boobs because of her and not the other way around, for her to give me access to them. And boy was it worth the wait, it was pure heaven.