Mesu Nochi Torare

Both are about netorare in a school with students, even the protagonists are alike since they both end up "helping" their girlfriends have sex with other guys (girls in the case of Mesu Nochi Torare), both of them have a similar feeling and belong in the same category of netorare, so yes, if it's your thing, go at it. 

NTR alert! Stories involves the girls or heroine point of view and they're taken forcefully from their partner by group of people. 

Clueless boyfriends has no idea with what's happening behind his back at all. The stories tells about girlfriends who accidentally got involved in deep problems with another man and they got blackmailed because of it. 

Both are hentai that involve the protagonist's girlfriend cheating him with a douchebag from the same school to later become netorare, this all happens in a school setting, only that in Unsweet the girlfriend is a teacher and in Mesu Nochi Torare a student and there's another girl involved (since it's two episodes, instead of one, there's more time for story). 

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. 

Two hentais featuring student counsel members being taken advantage of. Both feature blackmail elements and the classic "brainwashing" of the girls into enjoying their position. While Mesu Nochi is famously NTR, Seido Kaichou Ai has no NTR elements, and features a much stronger willed heroine.  

The protagonist watches how his love interest gets defiled by another guy, or at least in Mesu Nochi Torare, since Ore Wa Kanojo Wo Shinjiteru doesn't quite get there, it gets real close, but I guess otherwise people wouldn't buy the visual novel, there's still lots of cheating though, with the girlfriend or bride being reluctant at first to next being more and more into it, in both cases of course, there's also another girl in Mesu Nochi Torare, but the focus is mainly in the first one. 

These two hentai feature schoolgirls being taken advantage of and learning to enjoy it. Both have NTR elements, though in Oshioki's case it is a same sex relationship as opposed to traditional Male/Female NTR. While Mesu Nochi focuses on one girl primarily with a minor side plot for another, Oshioki has multiple female leads.