J.O.H.N. is a very good game, however be advised that this is not just a porn game, there are some sex scenes, and pretty hot ones at that, but the game focuses on telling a story in a mature tone and while this involves sex, it is not the main focus of the game.
The models are really good, with Jessica herself being a very attractive woman (nearly a bit too much, super-model like, I would have preferred a more "regular girl" looking model, but that is just personal preference). Thee male models are varied and different, and even the old guys are not your usual "disgusting old man" but just old men.
There are different characters that you can interact with and chose to which degree you get involved with them.
I particularly appreciate the fact that Jessica has a choice, I hate corruption games that are all based on coercion and it is very refreshing to see a game where the MC gets to chose what she wants to do or not. The only thing though is that she is a bit too prude for my tastes in some instances, in particular with Mr.Parker, with whom, after several encounters and obviously being attracted to him, she has yet to have sex fully.
Overall though I enjoyed the pacing of the game, the story is also interesting and well written, with different characters having well written personalities and with the whole world making sense and the situations being credible.
I will definitely keep an eye on this one and will more than likely purchase it once it is completed, hopefully on Steam or similar, it is well deserving of that.