bind - How to setup Cloudflare when I don't have authority over the parent domain?

I'm new to cloudflare and have a handful of web servers I'd like to run through it:
(I'd ask this on cloudflare's forum but I corrected a typo in my email address for the free cloudflare service and they keep sending the forum confirmation link to the typo address)

  www.my.domain.net
  hosta.my.domain.net
  hostb.my.domain.net

I've tried working through the cloudflare setup page and when it did the domain search for the hosts I entered, it instructed me
to change the nameservers for domain.net to "bill.ns.cloudflare.com" and
"tony.ns.cloudflare.com". The thing is, I don't have authority over the parent domain, domain.net.

What's the best way to handle this? My (Bind) SOA record looks (similar) to this:

  IN NS ns1.my.domain.net.
  IN NS ns2.my.domain.net.
  IN A 1xx.9x.4x.1
  IN TXT "v=spf1 mx ptr ip4:1xx.x2.x3.x3 ip4:1xx.x2.x3.x4 include:other.domain.net include:spf.protection.outlook.com ?all"

I'm not sure changing the NS lines to "bill" and "tony" on cloudflare would be the
right thing to do for my.domain.net since cloudflare seems to be wanting me to
change the DNS for the entire parent domain.

Is there a way to only send www, hosta and hostb through cloudflare and leave the
rest of my.domain.net "un-proxied" through cloudflare? Ideally, since I have no cloudflare-fu, I would setup a test host and experiment first before moving everything over.