There are different scenes, to not spoil much: One has Mezz be choked, and the other he is lifted and has an earing(Slut one), maybe this can help you figure out which you didn't get. Since maybe you got the slut scene twice but not the normal one? Lose thrice in the Entertainment District to get into slut mode. The game will go into a "stealth mode" playstyle and that's your cue that you're in it. As for the not being able to get the boar scene, it is a little "complicated" you know? To break it down what you must do:
Play the first game https://bitshiftgames.itch.io/cruelserenade and get slut mode/trained, same idea lose thrice to the boars in THAT game, then when you complete your run, bring a save file from that game, specifically the DataCrystal.js file to Gutter Trash, - that's a recap of everything you need to do.