Well, it's no surprise that she could build in a camera and all, but a camera of that quality that also sends video/picture feed... The battery would run out in no time and no one is charging it. At best it should be possible to use it a few times if the battery is big. I guess if it's just pictures, it might last a bit longer but still...
Also, they say that she's pretending to be a brocon, but seriously, anyone who'd do shit like this is a true brocon to some extent even if they pretend it's not true. Anyway, isn't it weird that no one notices that the eye is a camera? He even looked at it up close and normally you'd inspect something like that quite closely. Not being able to see that it's a camera lens is quite unbelievable.
Well, no matter what, almost yandere-level brocons are pretty interesting, especially if they're younger sisters, even more so if she's a loli despite having that twisted mind. Hehehe...