Sorry "lad"... as I said I got the book, massaged her once then nothing... I even tried without cheat following strictly your guide but Nothing. Oddly by the way, it's harder to make Sasha more "dom" than "sub"... so can your "guide" do something against what seems to me like a "bug"? I guess no... this is why I asked if somebody by any greater luck may have ever gotten that scene. If yes may he share his save or the console code he used? But due to the lack of answer, I may think nobody got that scene...
The console command to trigger the event is jump sasha_practice_01
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To be safe you'll want to do this at the recording studio.
Ignore that i'm dumb and thought you wanted the massage scene. I don't see a trigger for any foot related stuff in the event files but i'll keep looking into others.
okay the exact triggers to start as far as stats goes is
sasha.sub <= -50 and sasha.love >= 100 and hero.check_skill("massage") and game.week_day in [1,2,3,4,5] and sasha.get_flag_value("footrub") == 4 and game.hour > 20
So you want her to be dom, have more than 100 love, you learned the massage skill and watch tv with her during the week mon-fri. That should trigger all the events for footrub to foot job. You'll want her to be more dom for that though.
Edit 2: I don't think these are ever going to trigger due to the time requirement. I've only ever seen Sasha show up at 18,19. With the trigger being greater than 20 it's very unlikely to occur. That should probably be changed to > 16 to be honest.