Hi,
thanks for the update :-)
Although it is unlikely to get more than one officer to level 10 in time (except for infinite mode), I like the idea of this level being something exclusive. Another approach would be to end the game immediately when reaching level 10 (MC decides to stay on this station and "work" exclusively for the officer, or signs a marriage / sex slave / whatever contract and the officer pays the whole remaining debt, ...). In any case, this ending should have a special ending story, and should be considered a good ending and not a failure, otherwise there is no reason to accept level 10.