Another Undertale anti-skeleharem idea thanks to my mind poorly attempting to figure out dialogue for my tik tok vids.
So, something I've seen fluctuating with popularity in the skeleharem fics is the isekai into Undertale trope. So, imagine that two friends, one completely familiar with Undertale and especially the skeleharem fandom (though he'll be attracted to a different group in the fic), and one with very little knowledge about the game thanks to the friend, get transmigrated to Undertale.
This is obviously a dream come true for Friend while OC is just there for the ride. As they get settled, some things happen that make Friend realize that maybe they're not in the best situation while OC is struggling to understand the dangers.
First, they're both Mages. Which was cool; until Friend realized ABO Dynamics apply for Mages and Monsters, and not the flexible kind he'd prefer. He's quick to find out their alignments; Friend's being Alpha (a relief to him), and OC's being Omega (something Friend immediately panicked over while she watched with confusion).
Second, they live in a monster neighborhood. Preferable, since there were a lot of hate crimes being committed against Mages as much as against Monsters. However, one of their neighbors are the skeletons. Which wouldn't be so bad, if Friend hadn't been given a dose of reality that a good portion had darker morals and were really manipulative. Granted, he had no idea if any of them had changed or were different from their depictions, but he didn't want to risk catching their attention regardless. Which is why, when he kept catching a few of them talking or interacting with OC, he always freaked and was protective and stuff. Making her confused and the skeletons feel all types of ways.
Third, and perhaps the worst, is that most of the skeletons have a couple girlfriends. This wouldn't really be a problem, if Friend didn't realize that they're the anti-harem toxic type girlfriends. And when he does, he tries to warn OC to stay away from the guys, but she doesn't understand why. Mainly because she's currently not interested and because the skeletons are approaching her, not the other way around.
Don't worry. OC wouldn't be a meek or shy or defenseless type despite being an Omega. She's just kinda blind to the dangers that a seasoned fan of Undertale would be familiar with. Friend would probably end up with a different character because although he read a bunch of skeleharem, he also felt more attracted to Grillby, Mettaton, and Napstablook. So he's more likely to end up with one of them if not all of them.
