So far not found all donuts yet, that one takes pleasing some and dissappointing some and several playthroughs or rollbacks, but gladly there are photo walkthroughs of both doughnuts and peeping toms, peeping toms are easier to get has it not so hidden, but it involves been with all girls to show all.
Yuki i'm sure more will happen if you let it be, same with Kristina, but both will be hurt if you seeing others as well, Yuki is traditional japanese and Kristina is hardcore religious, best friend will forgive encounters with victoria, jazmin and the twins, but will be hurt if done things with cousin and connie and despise you if even slept with her mom or aunt. I love this story mainly because it about on how faithfull can you be or will you hurt people just like your dad did to your best friend's mom.
By the way, if you looking for an harem game, WVM is a very well written one, on top your girlfriend in there even encourage you to it.