🥀What should I do about Mortimers alien baby

I think he should have the baby and raise it. Part of the fun is to create your own storyline. I never play the premades, I should confess, so I don't really know their canon. I broke all kinds of Star Trek canon when I wrote my Mini-Series fan fiction. I did keep with most of the constructs, though. But I have watched this original Star Trek TV series so many times over the years, that some of the things some fans contend aren't canon, just are. Spock does have feelings, emotions, he just adheres to keeping them bottled up. He's also prey to the beauty of a woman, too.

All of this to say, just have fun with it!