The Point is that if a one night stand or such an encounter there are no stakes or fear of consequences. This would fit her personality. Her going crazy with Patricia and a random guy or more would be much more plausible than she having sex with someone like SAM or Dylan. If you then put on Alcohol or even drugs more can happen as well.You are missing or choosing to forget Patricia's words about her marriage to Carl. Someone with photographic memory or acess to the code will be able to give you the exact quote. But in simple terms Patricia is able to fool around so long as Carl is the only one that fucks her. Hence why Patricia is a complete flirtatious tease and she could quite easily be up for playing around with the museum boys. And why I think at some point Patricia will fuck Sophia. But she won't participate in an orgy.
Now Sophia has opened up and become much freer around sexual matters over the last two weeks. But she has not YET reached the tipping point where she will cheat on Liam. But she is getting far closer to sexual acts by which I mean either having her pussy fingered or giving a hand job. I expect both of these to happen before she gives a blow job.
So no, no orgy is going to happen at the museum with either Patricia or Sophia. Now hopefully it could yet be quite a hot encounter nonetheless as the two sisters might be increasingly flirtatious with each other, giving the boys a show, and I could also see them getting quite competitive teasing the museum boys up to and including handjobs. But not currently do I expect things to go much further. Sophia might see Patricia giving a blowjob and that might arouse Sophia and tempt her to try this in a future event with one of the main characters.
So as far as I can remember Particia said she was also wild in her college life so maybe they will reflect on that and let her go crazy as well. Honestly I do expect some crazy shit in the end and not only vanillia sex or a love Story with Sam.
Some routes look they can go into a very dangerous way. Like her becoming a sexslave, a prostitute etc. And hoenstly I hope we will see something like that in the end. Will it happen tomorrow or the next few game days? NO of course not.
Oh and Patricia will most likely break this rule she had at one point. with Sophia in some kind of scanrio so why not the museum which will not happen anytime soon anyway.