Hey, maybe Mia will like the elf's kind and gentle nature more than Top G's brutality. Hell, maybe she will like him more than the mc lol. Especially if the mc betrays him in some way.
It's possible, but from what we see in the Lizard scene, she might also enjoy some wild sex, but it would be cool to see an elf swap, the MC with the blonde and her with the Watcher. Dude, I like revenge when there's betrayal on both sides. Mia and Darren getting revenge on each other is something I'd like deep down. They might still love each other, but they'll do anything for revenge and jealousy.
And what about the idea of Mia sneaking off with Leia's husband? While everyone else sleeps.. for me, the best part would be seeing Leia at night messing with MC's head, showing him Mia's adventures. He would see every sexual detail in places they've already been, even at the current camp. After waking up scared or excited, he would think it was a nightmare like the others he's had, only this one was real. After the confusion of the dream, Darren would go back to sleep snuggled up next to a satisfied Mia, a little wet. It wasn't her best sex, but it's something she'll remember for a few days because soon she'll have more adventures with other guys and monsters, and Leia would be loving it all and waiting for more, in my "hypothesis."