Wow, I think this is actually the first real fanservice scene we've gotten in Re:Creators. And given Magane is, well... Magane, it's actually perfectly in-character for her to prance around her house in her panties and strike ridiculous poses. I'm actually a little surprised she didn't try to pull a "You walked in on me naked? How l-lewd!" fake embarrassment card on Aliceteria just for the lulz.
We also got Blitz's backstory this week, Hikayu is a useless ball of moe and her creator's personality is just about exactly what you'd expect from that of a stereotypical eroge author (that scene with him trying to perv on Hikayu was hilarious, though). Blitz and Altair's interactions were interesting as well. Her reminding Blitz of his daughter is hardly surprising (as "helping a female character because they remind him of his daughter" is a pretty common motivation in grizzled anti-hero characters like Blitz), but for Altair to reciprocate the feeling is a little more unexpected.
Not really sure what to make of their exchange, honestly. On the one hand it definitely fleshes out Altair and makes her more sympathetic, but on the other it's weird that someone who wants to destroy literally all of reality is giving him seemingly sincere and genuine advice on how to live his life. Doesn't Altair realize if she actually won both Blitz and his entire world would be erased from existence too? She's basically telling him "go and do justice to your daughter's memory, but just FYI I'm going to wipe you and everything you love from the face of existence in a few months anyway". Then again, Altair's whole character is a mess of contradictions from the bottom-up so it does kind of fit. You can almost think of it as her "breaking character" in a way, especially since she reverts back to her usual pretentious villain monologuing immediately afterwards.