Following up on Haylijah's marriage question, what do you think it would be like if they could have a son or daughter of their own? How do you imagine their reaction?
Considering it is impossible, I think they would both be incredibly shocked.
I don't really buy into the loophole that allowed for Hope to be born, but it's canon, so we just accept it. But it would be impossible for Elijah and Hayley unless they each took the cure, which they wouldn't do.
Putting all of that aside.
If they were vampires, I think Hayley would freak out. Again, it shouldn't be possible. But I think she would be excited. She was incredibly young when she got pregnant with Hope and likely hadn't even truly thought about whether she wanted to be a mother. However, she completely embraced it and was an amazing mother to Hope. I think she would have loved to have a chance to enjoy a pregnancy and feel more confident in her ability to protect her baby. She also would have a better support system this time because Elijah could unequivocably be there for her without worrying about hurting Klaus' feelings. But she would be nervous about telling Elijah since it's impossible.
Elijah wouldn't question her at all. He would question how it was possible, but as soon as he heard the proof of the baby, he would accept it. After all, they've already done the miracle baby storyline. Elijah would be incredibly nervous. His biggest fear is being like Mikael and he often worries that he failed his siblings. He would lean on Hayley for reassurance that he could do it. That he wouldn't fail their child.
Elijah would pretend to be the disciplinarian, but they all know who really is. Their child would have Elijah wrapped around their finger. He has wanted a child for so long, he would make sure his child wanted for nothing. Hayley would have to hold him back because she wouldn't want her child to become spoiled or an 'elitist' like their father. Elijah would insist they have meals together and would teach his child to cook while Hayley happily watched. Hope would of course be there, and let's be honest, the rest of the Mikaelsons because they are going to live together forever. They would have family game nights and family vacations. Elijah would make sure his child had the childhood he and his siblings were deprived of.