(Sorry there is some spelling mistakes)
-For the pass to UNA, it's random, but to get a quality pass you would go to the massage place and get a normal massage after that LinLin would notice that you have a not-so-good-looking pass and she will lead you to the tattoo shop, where you can turn your shabby passes into quality passes, but it's very expensive to do so.
-To hold hands with fawn you would need to go to the torture rack if you've unlocked that part of Fawn's route.
-While you can't find out where Bell is when she dissaperes, you can prevent that by buying the cowbell choker in the Naughty Kitty Store and giving it to her