I have several problems with Demons/Terra Prime, but I'll not bother with them at this point. What I don't understand is why Paxton chose T'Pol and Tucker as donor cells for his Mutant Offspring. It seems a little too coincidental that he chose two people already in a relationship even they weren't sure about. To me, it would seem more logical to make Archer the donor father, due to his high profile in the public eye as ship's captain. While watching the episode, I was watching for some reason as to why Tucker was specifically selected, but if it's mentioned anywhere, I missed it. So at the moment for me, it seems like it's just writers' manipulation of the audience, and rather clumsily at that.