Maybe the rank structure works differently in the British Military than the US Military.... (and the Space Force). Sarah clearly is under Chris' authority, and would be a no go. Also, once Chris hits the ground on the station she is the senior leadership and Kelly....
Oh fiddlesticks.
Chris can do what the fuck she wants with whoever she wants whenever she wants.... ok.
MC has to walk a fine line and must close doors behind him after he goes through. got it.
Sarah, Kelly, Chris and MC are all junior officers (O1 - O3) - yes, Chris & Sarah is no-go for now, until Sarah is assigned to a different crew or job entirely. Not stopping Chris from flirting though.
On the ground, the station is run by civilians, not military. Command is Amanda Walker - Chris and MC are O3s, sure, they outrank the rest of the military crew, but Kelly is not under either of their direct command structure. Sarah is not under MC's direct command structure. (Neither is Annie, but you're talking about and NCO and an Officer - which is
supposed to be a big no-no, but I found it odd how
twice an officer from my battalion married an NCO from my battalion - in one case from the same company - NCO moved to a different company.)
I would guess getting away with a public relationship with Annie would require one of:
- Annie quits the service
- Annie does something outrageous and manages to get commissioned
- MC quits the service
- MC and Annie marry and find a competent military lawyer to unravel the mess