"Yeah." She shrugs again, not delighted with the fact. An oath means next to nothing to Cortana personally, but it means a lot to the Master Chief...which as a practical matter ends up the same place. The Chief would hate it if she broke her word, so she's stuck.

The things she does for friendship.

"Gotta admit, the perks aren't bad." She holds up a hand and a schematic of the Legion World computer network appears over it. Roomy as a Forerunner facility, with way less chance of having to fight a rampant Forerunner AI.

She's still not sure she likes being legally responsible for her actions, though. 'Legally questionable' is more or less her default solution to problems.