Just my two cents being thrown in here, but I don't see the basketball games being as big of a dilemma as other people seem to make it out to be. For starters, assuming that we're going to play through every single game in the season seems a little ridiculous, I'm hoping and somewhat expecting that BD won't go that route. We'll certainly "play" a handful of games, but if we do play *every* game, we open ourselves to this problem people are having where "oh no we lost every game and this means either the story won't make sense because Harper definitely shouldn't keep her job or BD will have to create two separate routes."
So, simple solution there - play only certain games within the season, gloss over some others. If I were BD I would count most of these skipped events as wins, just enough so that Harp can reasonably keep her job without the player feeling the need to worry about their own game choices resulting in major storyline issues. Even if you lose all the games you do play, Harp doesn't get fired, you still make the playoffs/championship game at the end of the game (or wherever the story goes), etc. If BD feels up for it, they could just have the games that the players actually decide to win/lose impact the overall ending of the game, where winning more games --> better ending somehow, but honestly, the MC seems locked into having a great future either way so the harem will be provided for no matter what happens, imo.
As for the games themselves, easy - make winning the game an incentive, but not necessary. Win the game? Congrats, have extra sex scenes! Fuck Bailey, or Nat, or Emiko, or any of the cheerleaders after winning a game! Have a threesome or an orgy or whatever after a particularly important win! Make progress with Harp, potentially even have some one-off encounters with opposing cheerleaders or random fans or whatever. The point is, these scenes shouldn't be vital to the plot. Win the games and be rewarded. Lose the games and continue on as though nothing happened. Or hell, even if you lose the games, you can have alternate sex scenes - tough loss? Don't worry, Jamie and Shauna will be there to lift your spirits. But again, these scenes should just be bonuses, not story-altering, at least in my humble opinion.