Personally I would recommend you to download it. The story is very engaging, the characters are likeable and quite a lot, and you'll need time to process the references as well. You can speed run it but I don't recommend you, I believe that even playing with ease you'll have plenty of time to play it until next release.
I would only recommend for you to wait if the next patch comes out before you end the current content, but unless you reeaaaally are slow playing that would happen. I'm not slow when playing VNs, but I like to play with ease if the story is engaging with the MC. If that's your way as well, then go for it.
I'm pretty sure she, along with Jessica will be one of the last ones for that to happen. While many don't, I believe a fair amount uses the incest patch, and to make the story somewhat believable the relationship needs time to grow properly. Sure incest in games is cool, but if not well written it can definitely ruin a game.
Being family members for the sake of being family members isn't necessarily a good thing, what makes players hooked to a game is the character/story development along the connection of the girls with the MC.