Rather, what are the conditions to avoid it, since she does it almost always. She doesn't do it if Ian dates her and didn't piss her off so that she went for Jeremy.
You can even do a bunch of banging Alison and still get the threesome with her, Jeremy and Billy too, right? If I recall correctly all that matters is not going on the trip with her, in which case she'll get into the threesome.
Ivy drugged Holly with MDMA during the GH scene, no doubt about it. Even Lena notices her unusual state. It makes sense, losing inhibition so quickly can only be done by facilitators.
You know what's funny? His wife goes by the name of 'Lena The Plug'.
You can even do a bunch of banging Alison and still get the threesome with her, Jeremy and Billy too, right? If I recall correctly all that matters is not going on the trip with her, in which case she'll get into the threesome.
The major doubt about it is the apparent presumption this was done without Holly's consent and that she is some sort of poor innocent victim in all of this as opposed to willing participant who wanted to live a little for once.
Well, Billy strikes me as the kinda guy who doesn't mind fucking whatever, so he was probably both enjoying the free fuck and wondering what it'd be like to be her.
I don't believe there's any need for this. Holly who didn't form a close relationship with either of the protagonists develops one with a guy who spends time with her at work, compliments her, asks her out and hits on her. There's nothing unusual about Holly responding to it positively, even if she didn't start randomly hooking up before. Just like she doesn't need to hook up before to respond to Ian's and/or Lena's attention.