Mostly the shower/bath events, especially Nick walking in on Kate. It took me over 100 days of gameplay to finish those events, and there wasn't much to do during that time because all the content with the other characters was finished. So basically Kate woke up, ate, went to school, invited Helen, Ruby, or Jane to lunch to increase the relationship edit: romance stats, went to work to make money, went home and did homework and took online classes to maximize her grades, watched porn to keep the horny stat over 50, ate dinner, then hoped that Nick was coming over for the next one-of-four chance he would walk in on Kate the next morning, which requires that you have her sleep six hours starting before midnight so she wakes up before 6am, and then have her take a shower or bath at exactly 5:59am the mornings Nick sleeps over. I would sometimes go more than two weeks without Nick walking in on Kate once, then the next week he'd do it three times. Weird. .
Well, you are playing a different game, sir. Let me point this:
1) Shower/bath events - yes, you can grind this if you want to. Only if you want to. All you need to get is lvl 6 of events, and that's taking ~15 min gameplay. Yup, DS compiled a bunch of scenes in a grinding event - but the game itself isn't forcing you to complete them all - or to grind them. You only grind if you want to: and if you want to, why you complain?
2) If you are grinding Kate/Nick scenes - you don't go to school or anywhere else, just skip time.
3) There is no point of grindig money. You get enough money from Diane's path events - after you are done with this quest you have enough money to don't work at all.
4) There is no point of doing homework.
5) There is no point of online classes.
6) There is no point of keeping horny stat over 50 at all. The only reason to keep this stat is morning shower scene, if you want to masturbate with sis under shower - you need that.
7) There is no point in eating. You can keep the 0 all the time.
8) There is no such thing as time req. You just get this scene or you do not - events spawn at random and all the events are in 30 mins range. So there is no diff between 5:59 shower/bath and 6:17 one - if Nick gonna spawn his event, he will do so.
So, to put it simple: it looks like you made yourself a hell playing this game in a way... I don't know what way, "pointless" will be the best summary of things you were doing.
EDIT: When I say "nothing else to do" that's because by the time the Nick-walking-in-on-Kate events were the only remaining quest points,
There is no such thing as quest points in this game.
I had already maxed out Kate's relationship and romance points with everyone but Helen, Ruby, and Jane--Helen gets 2 romance points for every lunch date and Ruby and Jane only one.
There is no point or functionality of doing such things as grinding their romance points. I mean: you do something which has no point at all and you complain that you done this? Nobody forced it. Yeah, it's possible. It's also possible to grind cash for massages. But - what for?
To summary everyting: both revievs and posts here are for me W-T-F. People are doing pointless grind at will, while the game isn't forcing grind.