I'm holding out hope that no NTR takes place, but this story has now set up two different scenarios: #2's girl may have raped #4 along with her terrorist cult and gotten pregnant, and #3 may be about to cuck #1 out of his entire harem just when we find he actually wants to be a good father.
For those people assuming that #2's old gf had joined the cult in their activities with the prisoner, wasn't it explicitly shown that she didn't join everyone? There was even a scene of her asking another girl "why didn't you join the festivities?" and then "why didn't you?". Maybe I'm remember wrong but I'm pretty sure she just kidnapped him and nothing else.