I haven't read any of these yet, they're just in my queue, but I feel like adding some commentary at this point. Spoilers, I guess?
I know it's impossible to just keep making a series "hotter" because eventually you start getting into fetishes that turn off large parts of your audience and you ruin it as well as lose fans, but when artists attempt to walk back the ecchi in a sequel I always think he/she would've been smarter to just cap off the series with a final super-horny blowout chapter and then start fresh with a new story. Again, I haven't read any of this yet, but for example if half-way through the next chapter the guy passes out from sexual exhaustion while the mother's still extremely horny and she sees the cum leaking out of her daughter and then starts eating her out and they fuck... and then have one short final 3P scene showing them all in the future still together (so the anti-yuri brigade doesn't throw a shitfit or think it's NTR). That's how you conclude an oyakodon story.
But instead, after the next chapter it goes back to 2P-only... and it stays that way. Just a weird choice, I think, which is why it so rarely happens.
I'll reiterate a third time: I haven't even started reading this series yet, I just thought it's got interesting tags and I like long-running series, so if my take is full retard then I apologize.
I would have kept it as "Funako-mama" instead of "Mrs. Funako", but that's just me (assuming he still addresses her as such in the Japanese). That aside, thanks for this. It wasn't on my radar until now. I don't remember an oyakodon take quite like this one.