Yeah, both of them suck. I reread while I was waiting and they said Mr. Fox had a tolerance to the drug. Though the prosecutor knew what it was, a tolerance like that isn't something you can pick up in a month. (I agree it seems if it isn't his kid, he will snap. Or, because of how nonchalant he's been and that we know he'd rather rebel against his dad, he might not care and offer to still take care of him and the baby as long as no one else finds out.)
So that leaves four people we know about:
1) Mr. Fox's biological mom taking it while pregnant. Though it hit "the market" twenty years ago, that doesn't mean it didn't exist before then. His mom's second gender has not been revealed so she might have been part of a test group or took a precursor.
2) Drug dealer ML could have had him take a higher and higher dose on the sly, hoping he would go into heat and need him. He's the most likely and until that's cleared, he and the prosecutor are on the same level.
3) One of Mr. Fox's current parents. I could see his father wanting to get rid of him young but when he wasn't successful, the tolerance remained. It could also fit the stepmom trope but she has shown both kindness and embarrassment on his behalf. I see Mr. Fox opening up to her for advice more than her having malicious intent; it's just too much of a trope to not put her on here.
We might find out soon if Prosecutor is the baby daddy with the irregular heat due to the drugs. Something tells me we still have a possible twin trope (because we still have that happen every so often despite ultrasounds) or because of his high drug tolerance, the pheromones don't matter. I'm waiting for Mr. Fox to be readmitted so he and his school friend can be pregnant together for the rest of his time there (because we all know his alpha didn't want him forgetting about him so he gave him a "present") and for the confrontation with Drug dealer.
Mr. Fox needs to make the decision himself because he is going to be pushed one way or another for the remaining four months there, unless they extended the sentence due to the cafeteria so he ends up giving birth there.
at least now, even though the prosecutor acts sweet he seems like a man who'll snap if the baby isn't his and would think he's just wasted his time and minute efforts and would consider the person he btw graped a whore. white hair is a grown-up horny dimwit but he kinda cares for real? both are trash, well, that's what the story is about ig