Well, unfortunately, Netsuzou Trap has yet to explore the elements unique to such a relationship. Honestly, Hotaru could have been a male instead and the plot development wouldn't have changed much. The only part of the same-sex aspect of Yuma and Hotaru's illicit relationship this series has so far taken advantage of is using the gender excuse for Yuma to be either ignorant, delusional, or both; Yuma convinces herself Hotaru's actions are within the realm of comfort because they're both girls, insisting that Hotaru is being "weird" but there's nothing explicitly corrupt about their relationship. Aside from that, nothing. This could be due to the age of the characters; this is, after all, a high school series, and it is a common attitude within Japanese culture that females having a same-sex attraction is simply a "phase," they'll grow out of it, and it's nothing to think much about.
Netsuzou Trap does narrowly avoid the most glaring pitfall one would associate with a series that has such a premise in that it has thus far steered away from the otaku pandering route. While it could have easily settled into being a basic yuri series with the sole purpose of seeing girls making out, throwing the NTR element in just to make it feel "fresh" (and strangely appease the minority of people who have this fetish), and consequently lacking anything in the form of substance, it has instead played out more like a "daytime soap opera" (as the mangaka herself compares it to) with an emphasis on drama and character relations. That said, there's still plenty dashes of ecchi to satisfy the perverted crowd, while Yuma and Hotaru get "intimate" enough to please the traditional yuri lovers who might check out this series for that reason alone. Okay, maybe this is simple otaku pandering after all, but at the very least it does a fine job of portraying itself as something respectable.
The characters are rudimentary thus far and essentially fill out the mandatory roles for the story. Yuma is a dunce, and Yuma's boyfriend is innocent, gentle, and being played for a fool by Hotaru, who is manipulative, detached, and has a boyfriend as suspicious as she is. Nonetheless, they maintain the potential for growth and developing into a standout cast depending on how they are handled. They all have a number of problems and complicated relationships sure to influence how they develop here on out.
The art is standard for a school series. The backgrounds are mostly of basic school environments, and, in typical fashion, there are numerous panels that feature characters on pure white backgrounds. It is well drawn, clear, and defined, but in this state of the industry it would be much more unusual if the art couldn't be attached with these descriptors. The characters, both male and female, also look like basic school manga characters, but they are quite attractive. Yuma and Hotaru are especially attractive, which is essentially a prerequisite considering the nature of this story and the fact one of its selling points is the intimate interactions between the two girls. On that note, the more amatory scenes are quite... alluring. A couple moments succeeded in exciting even someone like me who is quite apathetic towards yuri. There is most certainly nothing to complain about there.
All in all, Netsuzou Trap is exactly as it promises: a cross between a yuri and an NTR, and it plays to the benefits of both (despite failing to play to the benefits of crossing the two). The drama is gripping, there has already been a couple of intense moments, the sensual scenes are attractive, and girls kiss. So why only a six, then? Mostly because the series is still more-or-less in its introductory phase. The story is barely starting to develop, the characters haven't really developed at all, and, in short, there just isn't yet much to it. The pieces are there for a fantastic psychological drama about depravity and sensuality, but it has a little while to go before it reaches that level. I certainly anticipate seeing how this develops.
