I kind of want to see how badly YQY and SQQ could fuck up their own reconciliation but still ultimately reconcile.
Currently my idea is that they have a drunken and/or hormones assisted tryst and SQQ gets pregnant.
YQY atticwifes him and forces him to keep the baby without actually explaining that you know, he actually loves SQQ and would never willingly abandon him so SQQ thinks the whole time that YQY only wants the baby not him.
The actual reconciliation comes after the traumatic birth because YQY was also not taking SQQ to prenatal appointments, so both SQQ and newly arrived SY try to die dramatically as is the Shen way.
But once they stop doing that and YQY actually explains his whole fucking deal SQQ is feeling much better - except that he hates the baby and can't look at or touch him without wanting to off himself.
YQY: Cool cool cool, there is definitely nothing anyone could have done to prevent this!
So SY gets a nanny and only really sees SQQ on special occasions and never for long, which is how he's like nine when he finally figures out his distant mom is The Scum Villain!!!
And YQY is doting but also distant because if he spends too much time with SY SQQ gets jealous.
So SY has all the material possession he could possibly want but is desperately lonely and thinks neither of his parents love him. He's worked out Something Happened around the time he was born and has determined all the lingering hurt feelings and trauma must all be his fault somehow.
And SQQ gets to feel like a failure and a bad mom and YQY gets to know he's a failure and that he could have spared his husband and son a lot of pain if he'd just opened his mouth earlier...
And yet when little baby SY asks him if SQQ hates him he's just like, "of course not honey" and pats his head.
YQY tells himself it's just because SY is too little but SY asks again and again as he gets older and YQY can't bring himself to explain...
"Will you at least tell me why you both hate me?" Shen Yuan asks him in their tent at the Immortal Alliance Conference. "I've asked him. He just glares at me."
"We don't hate you Yuan'er, we love you."
His son just sighs, "You don't have to keep lying to me, I'm not six anymore." And leaves.
The confrontation at the edge of the Abyss is extra messy and both YQY and SQQ are there. Really Luo Binghe turning out to be part demon is the least emotionally devastating thing that happens.
Both SQQ and YQY qi deviate when Luo Binghe wraps his arms around their son and pulls him into the Abyss with him.