Edit: Fixed Makato --> Makoto
Makoto is pretty fetching on Page 16. She's drawn with nice leg curves plus the jacket and high collar give a classy look. I picture a tan camelhair jacket and a cream turtleneck sweater.
Masami, by choosing her deadline over "saving" him, has definitely downgraded her status in the harem (even though Aki thinks "she made the right choice"). It is a manga though, and I'm sure that she'll be racing over once her deadline is past to "comfort" him as a fellow mangaka so we get another conflict arc.
Makoto rushed to save him without considering anything else. This is the second time she thought she had lost him, the first being when Masami tried to steal him away in Chapter 46 and would have succeeded if Aki hadn't thrown up on her in the Love Hotel from the dinner wine.
Aki's taking Michiru's "if you have someone you love then maybe pushing the line a bit is worth it" advice. And notice how in the vacation with her husband (Chapter 39) the small/ordinary "retro" room was depressing while with Aki the shabby "retro" room is "exciting". I guess it just depends on your companion. Her thinking that them "running away together" would be "exciting" means that she wants to, even if she really wouldn't do it.
If hubby were out of the way you'd have to pry these two apart with a crowbar. Hopefully he divorces her soon, or dies in an accident with a big insurance payoff (ha ha). Oh, there's a potential libido killer: hubby's injured in an accident and has long-term recovery in the hospital and at home, resulting in Makoto feeling crushing guilt and regret for falling in love with Aki which is made even worse as she can't stop seeing him in the vacant room. If that were to happen I could see a story arc where she becomes depressed and Aki stops her from jumping from those same cliffs.