I think the idea of the dev is to do a slow burn with the MC's relationships (Ellie doesn't mind the kisses anymore, Lucy obviously is attracted to him but struggles with that, and the only reason Rose hasn't jumped his bones already is Lucy's lie) and use Lucy to keep the players happy with sex scenes in the meantime. Works for me, but not for those with that weird only-the-MC-should-have-sex hang-up
As it now the male protagonist's relations get burned quickly, either with or without sex....
The main problem in the story is Lucy acts out of character, we have Lucy, part fairy, Rose, full fairy, Mallory, big shot magician, that all perform magic fuelled by sex, the fairy girls can only travel the worlds that way but Mallory can travel without but even then she is still dependent on it...
For the MC and his sisters the magic world is unknown or didn't even exist so there will be a clash of values, the magic world is like the peak of the sexual revolution during the sixties and MC and his sister are like they get thrown into the woodstock festival straight from their small strict christian values community with not even tv to have some impressions of flowerpower....
At the start of the story it's evident Lucy has a somewhat hidden agenda, she can't be telling about the magic world to MC, but after he gets the stone it's clear he has a part to play in this magic realm and there no longer is a reason to keep him from that information, it is even more important then ever to get MC adjusted to this new world as fast as possible....
Sure her personal struggle considering her feelings for MC will still be there but for her sex is just a basic need to perform magic so why would she even think it's a problem he has sex with another or even decide to sabotage his relations with other characters? I can accept there's a reason she doesn't take the step to have sex with MC despite she is attracted and has some feelings for him but it makes no sense telling Rose that lie, it just contradicts her whole being part fairy way of life...
It would make perfect sense for a fairy to help MC and his sisters accept their way of life in the magic realm, it would make sense there is a slowburn in some relations since MC and his sisters need time to adjust, to embrace the new world and give their values from their known world time to evolve or be freed from...
Clearly some taboo's would justify this slowburn and the fairies may need to do some convincing there but the more acceptable relations can evolve faster since hey, no matter if that guy is from a strict christian small community, he's still raging hormones and he gets alot impressions to help him there....
Lucy's struggles also justify a slowburn in her relation with MC, it would make perfect sense sex between them can be very late in the story without any trouble, but there should be enough good non-sexual interactions between them to pull it off that long and just acting like an antagonist would hurt that relation more then it will give reasons to want it afterall they are friends, they are attracted to eachother, there's some feelings, work with that, even with the internal struggles of Lucy that really shouldn't be a problem....
Reducing comments to this game to wether people want only MC to have sex does not do justice to serious people taking time to comment here, same as just blatantly bashing the dev is a no go...
Facepalm if you just want to bash but have no serious intention to give a meaningfull opinion