First of all, I read some comments to in Japanese DLsite. Their comments make me to to desire play this game. Such as, すばらしいNTR, キター!寝とり傑作 something like that
A word "Awesome", even though I don't understand all the Japanese. The voice from the heroine is a little bit naive, but represents the young wife perfectly, especially when she is moaning. And the art is also better than the first one. Same background music makes me a little bit disappointed.
I guess the plot: 2 years later, the boss tries to find the heroine. Then the protagonist hopes her wife to have sex with the boss again. The whole game only has two options.
The first one may be the good ending - Protagonist drives with her boss, seems like to blackmail him, then have an accident, then heroine stays with the protagonist.
The second one may be the NTR ending - Protagonist also drives with her boss, seems like to blackmail him, but no accident anymore. Then heroine still have sex with her boss.
By the way, It is just my opinion. It may not be true. Forgive my bad English.