The short answer is IDK lol Its not a bad question but I didn't get that far. For Lisa's potential biting kink is could be because she saw a scene in a movie where the characters are kissing and one of the characters gently bits onto the others lip as they pull away and she thought it was cute or kinda hot and she wanted to try it and it evolved from there. it could be a simple oral fixation, which kind of get because I have a bad habit sort of self harm thing of biting onto my index finger when I get frustrated so sometimes there's just a strange need to sink your teeth into something "Krystal has this same bad trait cause its called wolf bitting lol" and for Lisa is kinky and hot. Enjoying being bitten is probably different tho lol it might indicate intensity of desire like their so into or turned on by her that they need to sink their teeth into her, I'm not sure tho.

Vicki is tricky cause it could be several things, I don't know if she had a moment/awakening Vicki's Breast expansion kink is subtle. It could just be as simple as people gawking at her chest asking "Oh my god! have they seriously gotten bigger?" and Vicki checks herself out and the idea of them still growing bigger was kinda exciting to her plus their sensitive and the bigger they get the more sensitive they become so it probably compounded her excitement, or something I don't know lol