Lol nothing, the weird thing is though if she likes a nasty fucking it is 99% of the time in games with the abusive dick theme only with the abusive assholes and not with MC. Why would she be more open to harder things or only open to it with strangers she can not trust already, as with someone she trusts. I never get a woman that does not know me at least a bit and knows that I know what I do, wanting me to choke her after a date or two or when she knows I had quite a bit of alcohol.

It is not really sane or safe.
To be clear I do hope the girls will go more nasty with Sterling over time as just a missionary fuck in a bed, Yes, please. Go as nasty as you want that would still fit the girls and with Lydia that will likely include public sex, since it is her thing, just Sterling needs to get more comfortable with it and it stays relatively safe situations which is not in a cabin with two guys in there and watching that you do not know and might be armed and psychopaths or just assholes that are not above a rape or two.
If you noticed my objection was against MC crying and sitting as some nincompoop in a corner, which is not as he has been setup, not that Lydia could not decide to give those two old guys what they want in a "what if", unless you radical change Sterling and set him up as such in the what if.
Just if she chose so in front of Sterling as canon, well that would have consequences for their relation, just like he had problems with being forced in that situation in game by her for good reasons and dev did give Lydia some reasons for her actions in game.