I'd argue that this game has less sexual tension and more sexual frustration. Yes, the girls all hate Bobby and they are very hard to obtain. Almost impossibly so. What was tension to begin with has gone beyond that to annoyance, or just doesn't do anything for me because I know it's not really going anywhere soon.
I do love sexual tension, and I think incest games have the potential for even more tension. I'm disappointed if a game jumps into the incest too soon before that tension can build. But this game squanders all that potential by focusing on the tension part to a fault. I suspect that Rainces feels like you do, and values the pursuit higher than the prize. Maybe the prize isn't even important to them. For me personally, the pursuit is fun, and a good chase makes attaining the prize all the much more exciting, but ultimately, I'm there to win, and it's the prize that I'm going to enjoy far more than the path to get there. If I don't, then that's on the dev. Too many devs spend several updates or more on the chase and then the prize is over in seconds with a lazy render or two and very little foreplay or dialogue. I'd prefer the sex scenes to be elaborate, with multiple renders and a good amount of dialogue leading up to the fun and then also during it. The longer the chase lasts, the better the prize should be as well. As it stands now, I don't think the chase has been worth it in this game, but I'm invested in this after a couple of years and want to see where it goes. And we could walk in on Lucy masturbating on Bobby's bed crying out his name at this point and it wouldn't do all that much for me because experience has taught me nothing is likely to come out of that anytime soon. The scene won't end in sex. Somehow it will end up with Bobby farther away from sex with Lucy because she's mad at him for walking in on her in his bedroom or something. In any other game, a scene like that would probably be masturbatory material, because there would be tension, and I'd have a fairly safe assumption that even if it didn't go anywhere right then and there, it was moving us closer to the prize.
In short, if you enjoy the chase more than the prize (and there's nothing wrong with that), this game is going to be fun for you. If you're looking for actual vaginal incest, then like me, you're likely to end up incredibly frustrated, and also probably disappointed when it does happen because it won't match the time and effort put into it.