Okay, haha, oh wow. I was thinking that Ayako was letting a few unmotherly feelings slip, in earlier chapters, but I didn't expect things to escalate this quickly.
Actually, now that it's come to this, Akira might make a surprisingly strong addition to the story. I know people hate love triangles, but the biggest tension in Ayako and Asuka's potential relationship - okay, the second biggest tension in their potential relationship - is that Ayako may be looking at her daughter as a substitute for her husband, right? Asuka has half his DNA, etc. Well, if that's her motivation, then doesn't Akira serve that purpose much better than Asuka ever could? Not only does she share much of the husband's DNA, she shares Ayako's pain of having lost him, she's an adult, and, y'know, she's not her goddamn daughter. That's (usually) a bonus.
If Ayako wants a replacement, Akira is eminently the best person for the job in every way. If Ayako chooses Asuka anyway, then it'll be because of Asuka's unique qualities as an individual, and not because of her similarity to her father. Or it'll be because Ayako secretly has a massive incest fetish and just thinks it's totally hot to get it on with a family member, but shhhhhhh, never mind that.
Also, jeez, all these three-syllable names beginning with A are a bit much. What's next? Will the father's name turn out to be Akio? Are we going to meet their neighbours, the Aikawa family? Is a CPS agent called Atsuko going to threaten to tear them apart just as their relationship is starting to take off? Watch out! She doesn't look like much, but she's a specialist in aikido! Christ.