Can someone write a guide for the secret breast options, characters, endings and stuff like that?
I don't think anyone has done a proper guide for this game because it is pretty large and involved, but also pretty straight forward. If you want a certain person just pursue them and don't commit yourself to the others.
Kate can be your love interest on any route (except Nazarov at the end).
Nazarov wants you to be a plastic bimbo whore. So just support him at every turn and make yourself as plastic and slutty as you can.
For the Todd route just support and love him and don't fuck around with his father.
For Jack you need to string Todd along and keep his interest the whole time so that you can be your new daddy's secret sex toy.
For Oliver just push Susan to get involved with him instead of Chad. Help her to be his perfect snow bunny, convert her mother, Olivia, and work on REP. Then commit yourself to him and creating a BBC worshiping propaganda machine.
For Chad again push Susan into his arms. Become their willing sissy cuck. Let him get Susan into becoming a porn star while you confuse him sexually by seducing him.
For Cade when Olivia shows interest in him take him for yourself instead. Then just be a supportive and faithful girlfriend.
For Lexi you have to keep going to the second floor of the Cauldron and hang out until you trigger her intro. I think you just can't offend her when you first meet and eventually she will let you go to her apartment.
The game itself has the notepad that will give you the next hint if you are stuck. Sometimes you just need to wait for the next event to trigger.
There are some routes I haven't ever done too. I haven't ever tried to hold on to masculinity, so I don't know if it's even possible to stay "male". I haven't done a faithful Susan route (I love watching that crazy bitch let herself be turned into a complete slut), and I am not entirely sure if there is a full Henry route.
I'm sure I'm missing some stuff too, and there is tons of hidden content in the game. For example sometimes you can go to the offices in the Cauldron and peep on Katie having sex with Nazarov. Maybe one day someone will post a full guide, but overall it isn't really that difficult to get the path that you want.