Downloaded and installed it several times (opened in the download folder, not a specific new one), I don't use any mods and don't run it in an emulator. As far as I remember, I asked her once, early days, when the option first showed up, but I spamclicked over it, so I don't recall the conversation - then I went for the "Flyboy" Option in my quarters, that's when the option disappeared. Didn't think much of it at the time, thinking it's maybe part of the new version (I played the older version already and started over from scratch). As I've seen those interactions already in the first play, I can live with the loss, but I don't know if the lack if Sluttyness can cause problems with later content. Do you need any Files?
Did a code review:
Favour apears when:
"GAME.getLoc().ID =='LOCNav' and (GAME.questSys.inProgress('QID_TRIS_FAVOUR') or 'favours_agree' in tris.done)"
Which of the following Quests Do you have in the quest log as not done:
(A) "A Favour Requested",
"Ask T'Ris in the evening for 'compensation' regarding your efforts around the ship...",
(B) "The Need For Distraction",
"With T'Ris not available, search your cabin for another source of 'distraction'...",
(C) "Caught In The Act",
"Talk to T'Ris in the evening regarding the unfortunate incident...",
Until A is not done, the menu option is there as well.
If B is active, you need to use the magazine in the evening to get caught
Once C is done the favour option always shows up at 19:00