I am not really sure what exactly TG means, but I assume you're referring to that fantasy on the Cole Dom route where he gets feminised/turned into a woman? Iirc, there are plans to add this element to the actual story at some point, but it's going to be a while before it gets implemented. My best guess is that it will be part of a mission much later on in Season 2, which is still a few years from now.
I also recall reading that he's the only character that is planned to be permanently transformable (so probably not the best game to play if this is what appeals to you the most). Other characters could still change temporarily, though, like how the MC gets feminised in one of the guest missions.