Doubt it.
Sia seems like the one that's going to be hard to get since she's pretty much trying to make you avoid doing anything remotely sexual for her to show interest in you as a person.
Andrea has already given the MC a handjob and been fairly aggressive about wanting to get her itch scratched. Can't see plowing her being prolonged more than Sia.
You may be right and I don't discount what you're saying about Sia, but I still wouldn't expect a fast progression from Andrea. There's a formula that a lot of devs follow for the "end game girl" and she fits the bill. Note, the end game girl doesn't have to be the very end of the game, it's just a term I use for girls whose content is held back for a period of time for whatever reason. There are a few questions you can ask to see if a girl can be considered. The more yes answers, the greater the likelihood of "end game" status.
Is she the "landlady?" ---- Yep, and an actual landlady this time too!
Does she have big boobs? ---- I'm gonna go with yes on this one.
Is her content being teased? ---- It's ep 4 and have we even seen her fully naked yet? Maybe I missed it b/c I'm focused on my girl Aurora.
Does her sex content start with a HJ? ---- Yes, and that means sex will probably progress through the standard AVN flow chart (HJ, BJ, Boob job, Thigh job, etc...with most being clothed and full sex obviously being last).
Not an exact science I know,
but I've seen enough of these to know an end game girl when I see one. And then you look at girls like Mi-Sun whom you meet and immediately have full sex with. It would be different if full sex would be held back with most of the girls like some games I won't mention, but here some jump on your pole right away. Hopefully, for Hargas's sake I'm wrong though. And maybe the dev will see this and include full sex with Andrea in ep. 5 just to prove me wrong. In which, case, Hargas, you're welcome!