hope that helps because those C-cups up there are definitely not C-cups. I have breasts about that size (maybe a bit bigger, it's hard to tell), and I'm a G-cup (in most brands at least, since this can differ from brand to brand)
I agree with the boobs hurt thing! They are painful! Especially when they get hit! I've got elbowed a couple of times there and it hurted! Gladly they didn't meant to do that and apologized. Then one time I was playing basketball and someone tossed me the ball but I didn't FULLY catch it so it hit my chest so I was just there hugging my chest for like 10 minutes.
It depends on how you bind them, and is more about breast deformation. I assume you're talking about binding with wraps and not a binder. You run into more problems binding to be flat-chested than binding for support because you are essentially attempting to squish yourself into your rib-cage. The breasts WILL be damaged if you bind often and tightly, binder or wrap.A large breasted woman trying to go completely flat will have breathing issues too and you can actually faint from it. And larger women will face more deformation than not-so-large chested ladies. Binding for support tends to keep the breast shape because you're NOT trying to squish your breasts flat, and (if you know what you're doing) you're actually supporting your breasts in the right area. I would suggest non-elastic wraps for this. For me, I'm lazy so I just wear 2 different sports bras that support in different areas. I strongly suggest just investing in a really good sports-bra, unless you're cosplaying a sarashi.