Well, if she's at home all day, she won't meet many men, making it so that someone who delivers packages to her home would probably be one of the few men she sees on a regular basis, and someone who delivers packages all day would tend to get pretty buff. I can see how a hunky guy who keeps coming to her door could be attractive to a woman - especially if she's not getting much action with her husband. And it's not like a lot of guys wouldn't be interested if a hot chick came to their door on a regular basis. It's the same thing but with a reversal of genders, and more women are home all day than men.
Of course, there's also the question of whether this is actually a fetish that Japanese women tend to have or whether it's just something that's common in hentai. But it does make some sense when you think about it.
I definitely wouldn't consider this vanilla, not when it ultimately looked like all she really cared about was his giant cock. It could have definitely gone in a vanilla direction, but it didn't really. And if she were tsundere, it's really just about admitting how much she loves his cock.
I could see this ending with him being in a position where he's sleeping with them both on a regular basis, but it doesn't actually do anything to their relationships with their husbands/boyfriends (maybe even improves them, because they're all glowy and happy from the great sex - it seems to be happening to the mother already) - particularly since the guy seems to be pushing that cheating is a great thing and makes the sex feel better; if he were to get them to leave their significant others, it wouldn't be cheating anymore, and his whole bit about the sex being better because it's cheating falls apart.
Also, while Higenamuchi seems to really like cheating stories, none of the ones here on FAKKU are labeled with NTR (though I don't know what Higenamuchi has done that hasn't made it here). So, while I can see why someone would think that this was heading into NTR territory, that really doesn't seem to be where Higenamuchi seems to like to take things. It seems to tend to be cheating without causing anyone to break up or otherwise destroy their pre-existing relationships.
I can't say that I'm happy with the ending (he shouldn't have forgotten), but it did end in a way that a sequel could easily have a proper, vanilla ending. So, hopefully, we get a sequel. :)
I have to say that the detail on her uncensored pussy is pretty amazing - a _huge_ upgrade from the fairly heavy censorship in the version released in Japan.
Woohoo! Aiue Oka's work is awesome. I've bought several of the dojuins in Japanese (including this one), and the artwork is fantastic. It'll be great to actually be able to understand what's going on now. You can infer a fair bit from the pictures, but you never get all of the details. Hopefully, we get Aiue Oka's tankoban's in English here as well. I've been debating buying the latest one (several of its chapters are in in the subscriber's section, I think), but it would be so much nicer to get the whole book in English.
Clearly, he doesn't read enough hentai. _Of course_, she was going to throw out his collection. How could he expect otherwise after the way she reacted? But he seems to have won out in the end, since it sure looks like she's willing to go at it more than twice a month now.
And wow does 212 draw sexy women. Their proportions are fantastic. We clearly need a tankoubon or three from 212 stat! :)