I don't think Adam would care if it wasn't his baby and it was Eden's, because he's already aware that you're dating Eden. So it would be odd if he were to react negatively to you getting pregnant by his dad.

However, if it's his baby and not Eden's, I think he would feel a thrill he would never admit to, knowing that it was his seed that took root in you and bloomed another life into you.

I also don't think Eden would be the type to ask for a paternity test since he's not really aware of your promiscuity in canon, I believe? He accuses you of slutting it up when he sees you wandering town after not coming home for a while, but he gives no other indicators that he's aware. Not to mention how Adam's son would most likely resemble him enough for him not to question whose baby it is.

Which is a relief for Adam's freaky ass. He also still wouldn't use condoms after all this.

Okay, so I think Adam is definitely a LI you have to crack, in the way that you have to have him at high love and trigger a certain event for him to even consider you as his s/o... It's like how Robin has certain conditions that must be met before you can romance them, but Adam's mechanics obviously don't require you to take on a debt or some shit...

Adam can be unlocked as a LI if you have him at full love, full approval, full dominance, and at full lust. And I think once that's achieved, you will trigger events in certain places wherein it's clear that he wants you, and you can either choose to reciprocate, deflect, or to outright reject him then and there. Rejecting him doesn't permanently block him from being an LI for the run, same as how you can choose to reject Sydney and change your mind later. The difference is that these events just don't trigger randomly anymore, and instead, you have to approach him during specific times (weekdays at Fishing Rock specifically) to tell him you've changed your mind.

With my ramble about his mechanics aside, his main thought beneath being ecstatic that his loser ass finally has a girlfriend is guilt, because he's essentially cucking his dad with a person he views as his younger sibling that he just decided that he needed to protect. And to add onto that, Eden won't even be aware that you're dating him because his selfish ass definitely wouldn't share you, least of all with his own son. So he's guilty AND scared as shit.

And now you may ask: "But David, doesn't this go against the old dadson lore you had planned?" and to that, I say: Yes! I find the idea of him cucking his own dad hotter, sue me. I briefly thought of PC bringing up how he's better than his dad and he tells you to shut up but you notice how his thrusts get quicker and that made my weewee hard, therefore, it's the new lore.

I think since he's not as capable as Eden, he unfortunately won't be able to break him out of the asylum. And, despite all his yearning for Eden's approval, I do feel like he would see this as an opportunity to be finally free of his father. But he'd feel too guilty to leave him be completely, so if the asylum even allows visitors, he would visit Eden weekly. If not allowed, he would at least fight trying before ultimately giving up. Guilt definitely eats at him every day, but if PC's there for him, their presence at least alleviates it.

But this is assuming that the PC is at high love and has the Stockholm Syndrome: Eden trait. If they don't have the trait (therefore also meaning that they're not even in a relationship with Eden in the first place, and by extension, him), he would definitely harden up and try to be like Eden. But if they do, and they're at low-mid love with him, then the relationship would be a little rough, and you have to work for his love and approval (just as you normally would, honestly), but it would ultimately end up like the high love scenario once you max him out.