@AlphaAndOmegaWolves It's been a moment since I messaged, but I did previously mention that Develyn and Frisk starting a family of their own since they are married. I explained the whole process of the Hybrid's having offspring in the Christmas Proposal chapter of the story.
I was thinking about something astronomically rare for the new members of the Dreemurr family (Dev did keep his last name, while Frisk changed hers to match Dev's, I understand they each have choices, but let's keep it traditional, and yes, members, I'm thinking twins). Once Develyn and Frisk return from their honeymoon in AK, they drop the bombshell that Frisk is pregnant.
Hybrids tend to have a special connection to their offspring they pick up rather quickly if they can carry the Hybrid bloodline. Fjaltneir felt that connection with Dev while the latter was in Vanessa's womb. Dev and Kris (eventually) will feel those same feelings. I going with twins that are both Hybrids (no documented case, they're usually single) and one of them had the Hybrid trait modified slightly to where they're a Monster dominant Hybrid (next to impossible, and he's a goat, solidifying Dev's relation to Kris so that they no longer question it). They do get along when it happens.
I would anticipate a late December (after Christmas) - early January due date if you do approve of this, but some filler stuff would be nice to fill the void (such as a sleepover between Asriel and Noelle, or that ChatGPT chapter I proposed as ideas a while back).