Oni Chichi: Re-birth

In Oni Chichi: Re-Birth they decided to go for a netorare route, not sure why, but that's what Kanojo Wa Dare To Demo Sex Suru is all about, netorare in mostly a school with the students and the teachers involved (or other people too), so yeah they are very similar, except that since Oni Chichi is a series of OVAs it doesn't end just there, but that's why the recommendation is just for Re:birth. 

Netorare in (mostly) a school, both of these OVAs have that, besides that both have technically two girls at play, with or without sailor fuku and with one being a blonde, those are enough reasons to recommend them. As a side note Oni Chichi is a series of various OVAs (this is the one is the more oriented towards netorare), so better watch it in order. 

I'm not exactly sure why, but in the second OVA in the Oni Chichi series they decided to mix netorare, or maybe netori I guess to the story, they may wanted to go for a variety of sub-genres or something, anyway that's exactly what Unsweet is about, it also happens mostly in a school like Oni Chichi and the girl cheating is a teacher with a student, basically the roles are reversed to Oni Chichi, so there's that. 

Oni Chichi has a lot of sequels, that's what happens when you're popular, so of course they would sometimes change genres to vary things and just on the first sequel they went face first into netorare, you decide if that was a good choice. Netorare is also the category that Otome Dori belongs to, with school, students, the cheating, but a lot more hardcore and cruel than Oni Chichi:Re-Birth, simply because it's not a franchise as big, but if you like one, then you may also like the other. 

As a curiosity they almost came out at the same time, only by a month, but anyway, both are rather mild stories about cheating, in Ore Wa Kanojo Wo Shinjiteru the protagonist doesn't even get to watch her bride in the act of cheating and in Oni Chichi the guy practically sell her daughter, to later make like this wasn't the big deal, so yes, one gets to the netorare part the other not quite, but gets more to the part of the girl getting to like cheating sex, so both are practically mild stories about cheating.