did you really read? no one called it ntr except darksith and he was refering to put it as a warning, and it seems you also need to update what ntr means... since any potential love interest or close to the mc (mother sister) can be perfectly ntr, about this game is clear is not ntr since Ashley is not related, is not a potential love interest and is not close / or in a relationship with the mc.
Rythan25 she is not related to mc by blood since they both have different mother and father, also they are not close neither the mc is interested in a relationship with her so nope that tag cant be used in this game, also have in mind that scene happens because the mc will use it against them since he takes photos of that act, thats why the mc needs to see that.