E-5 tells E-6 in her own unit. She already reported it. The E-5 now has no say in the matter. The E-6 has no choice but to pass it up the chain.
The E-5 doesn't know what actually happened, so what is the E-6 to report? Hey Chief (or Skipper) this E-5 went out got drunk, banged boots with some dude and doesn't know if she consented or not.