To paraphrase what's been said before, CoC2 will have little to no involuntary TFs. Lots of players enjoying having their character exactly as they want them, and while things like getting tf'd at the end of an encounter without realizing that that could or would happen before the encounter may be fun for some people, they won't be added in because that would upset other people for suddenly changing their character without warning. If an encounter or taking an object will result in a TF, it'll very likely be a warning that something can happen and have an option that won't result in that. And sure, that gem thing could potentially happen, assuming it's rather clear from the text that it will TF you if you take it, although perhaps it would be better to have it so that it doesn't do a passive tf while in your inventory and instead is, say, an accessory like the Collar of Submission that makes the character more feminine when they intake cum. But accidentally pricking yourself on Lycanthorn and immediately getting a tf from it, or having an encounter with an NPC end in a forced TF (outside of bad ends, but those aren't really TFs cause they're more of scenes and scene descriptions once your character's journey has been forcefully ended), those are almost certainly not going to happen. Even the one character which can forcefully change you after a battle, Meira (Tanuki Witch), gives you the option to accept or deny the forced changes at the end of encounters the first time you win or lose.