Haha I'd like to get them, too! I'm only asking about potential scenes suggested by CGs from the game folder... I haven't finished yet. Maybe someone is working on a walkthrough, but I've found the in-game hints to be adequate for all but the Nick-Julia events. But it does seem that
@vimmers had the main trick to making progress. On evenings when Nick is staying the night, sleep six hours at around 23:45-23:55 rather than sleeping the night, then take a bath or shower at 5:50-5:55. I had tried that, but twice in a row Julia came in with Nick, so I stopped trying. But it looks like it's basically a 50-50 chance, so just have Kate keep doing that.
So, given that Nick spends the night three to four times per week, that means he might catch Kate in the bath/shower once to twice per week. So it will take
weeks of gameplay to reach the end of that path.
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When there's stuff to do at the college, that's not so bad, but I've reached the end of all the other paths and maxed out the relationship points for all the nPCs, so it's really just a matter of working each day to make money and skipping a LOT of time and crossing your fingers that Nick walks in on Kate the mornings after sleeping over. I'm making slow progress, but I think I'll wait until the next update so that there's stuff to do during the day--otherwise it's weeks of wait-wait-wait-wait sleep six hours [hope] wait-wait-wait...