Simply moving the decimal place over one spot on all grind actions so as to benefit you 10 times faster wouldn't have even been enough. Nobody enjoys excessive repetitive grind. Eric's invisible counter-grind was the worst as well. Had that been made more visible, and controllable the game would have been far more interesting.
Worse part about the grind is that every stat was just used once. The massage was only for Alice and was needed to unlock the erotic massage for Ann. And both were necessary to continue the story. The whole sneaking thing seemed pointless (once you've seen the girls naked, meh, same picture next time, so why bother), but suddenly it became necessary (along with the luck skill) to catch Eric peeping on Alice. Not that it mattered, the whole thing was just to show how much of a hold Eric had on the family (which was the dumbest thing ever and for once, I totally got the Eric-hate bandwagon), no matter your influence. And then sneak and luck were never used again. Every other game where you need a certain skill to beat a boss, there are other uses for that skill, before and after that boss.
As for the counter-grind, that happened each time Eric spend time with the girls. So that meant a flat-rate increase every week when they went shopping, and when Eric bought Alice clothes and the sex eductation with Lisa. Alice was countered by buying her clothes instead of Eric, meaning a money sink (the whole Alice thing was a money sink, hope Aleksey handles this better), and Lisa was stopped through game progression making it a non issue. As for the weekly increase, as well as the influence on Ann, that was countered by the grind fest of doing chores, which I just did to pass the time, because, damn, was there nothing to do in that game. So, Eric quickly became a non-issue, because doing your chores was enough to keep the "game over" at bay. After Eric left, the whole influence became another non-used skill. Which reminds me, was authority ever used for something? Because I think that also became a non-issue. If you didn't peek at anyone, you didn't get punished (and why would you? Been there, seen it, no need for repeats), so yours never dropped. And authority didn't degrade, so when your authority over your sisters was 100%, I stopped setting them up, because it served no purpose, other than longer breakfast/dinner that could have been skipped otherwise.
So, Aleksey, if you're reading this, make the influence thing more meaningfull somehow. Have Eric spend time with the girls outside his scripted behaviour (not off screen, of course), but a surprise talk with either one when he comes over, just to keep us on our toes (and showing us he's actively trying to get into their panties). As for the authority, have it degrade over time, so we need to remind them who's boss. Again, Eric can play a part in this. On the war path, he could blame us for something, causing our authority to go down, or on the friend path, he could blame the girls, increasing our authority. Again, just to keep us on our toes and play the game as intended, rather than just skipping it because it's become pointless. Also, make the skills more important by using them for more than just one character once. I'm sure more girls than just Alice need to be massaged, or perhaps sneaking into someone's room to steal something (first thing that pops to mind, on the friend path, we could prove our allegiance to Eric by stealing Alice's panties while she's sleeping in her room).