I don't know how intentional it was, but did you know that you misspelled "Incest" in the title as "Insest"? As for the incest factor, Mother type is my favorite, perhaps because gaining inspiration from the Holy Bible. Deuteronomy 22:30 tells us that "A man is not to marry his father's wife; he must not dishonor his father's bed.".
This provides irrefutable proof that Mother incest is the hottest type because it's the most forbidden! God knows how hot it is, which is why he forbade it explicitly! Good thing I don't have to violate his words in order to jack-off to this :D

There are a few scattered typos, but overall, great job! 5/5.

Base +24, coaltrain -8, Nefasturris -9, khrizto -6, Palaxius +20, kurono -14, crazymagic -10, GuroLover12 +6, Rakuko -8, Setebos -34

Page 3: Nya Give me some food.
Dat Win Cat

Base +9, Darkness Despair Destruction +10, aloc1234 +26, Rei-Tenshi +38, yoyo546 +23, Shevanel +4, Lord_Obagon +29, crazymagic +10, sv2011sam +8, GodMan7 +9, Tenzori +9, Borand +6, Voltmetre +8, and 15 more...

Can't stop laughing at page 2.

Base +6, sv2011sam +8, Rakuko +8, Tenzori +9, Dushmanster +8, D u b b y +12, Tamaki-Kousaka +10, BATMANS PANTALOONS +9, leftforlife +6, lannefenty +5, Knife Prty +4

THIS is what brought me into the world of doujin and hentai. It has never left my memory and I thank you for decensoring it

Base +5

OK, at first I didn't understand... I thought they already knew their identities from the very beginning, but then as I was reading they were hiding them actually, so people wouldn't know they were a "couple" of different ages. So... I think there's a plot hole there... how did both of them agree to meet in the first place? was it on a chat room, and ad in the newspaper?? Only add that and you have a perfect story.

Base +11, Knife Prty +4

So short hentai...

Base +1