Not implemented yet. Once it's in the game, you must get her to 100 love and finish up any other important event before being able to access a spicy, big scene to level her up. Changing her forever ~
I can't provide any, since my JoiPlay in parcitular always crashes when trying it xD I've only heard from others about it being playable there. Try following JoiPlay's own instructions, they're straightforward.
No girl can be corrupted past Lvl 1 yet (the purple hearts in the love bar). Yet, there are exclusive scenes to many girls once you get to Love 100, so as always, follow the gallery until you've seen it all. If it ain't there, it ain't in the game
I have reviewed the steps needed to properly port it to Android, and sadly, I won't be able to make it work. Too many work-arounds and setting up web-servers and such... I'd love to, but it's a pain in the ass.
Some encounters will definitely question Nick's morality going forward. Not much of a choice though, things will just happen sometimes, and you'll be there to witness it.