Natural Selection (Human Design #2) by Katie Allen

There’s something wickedly naughty about love on the run
Darwin Bloom has no true identity—his laboratory creators made sure of that. Darwin isn’t his real name and living on the lam doesn’t exactly allow for deep romantic relationships, but the feelings he’s developed for engineer Tom Cooper are strong enough to try.
Tom Cooper’s life changed forever when he met Darwin. Gone are his fears of intimacy—Tom wants to do whatever Darwin asks, whenever he asks. How is it that the big, beautiful construction worker can seem dangerous and delicious at the same time?
But when Darwin’s mysterious past comes back with a vengeance, there’s more than just incredible sex at stake. Darwin promised Tom he’d never leave him…but keeping him safe might mean doing just that.

I picked up Natural Selection before I realized that there was a previous book. Honestly, it didn’t make a big difference. I wasn’t totally lost, but I did find myself wondering exactly what did happen to Darwin when he was held captive and essentially used as a lab rat. For that reason and the fact that evidently all the characters who will eventually have their own story were introduced in Erotic Experiments, I’ll probably have to go back and read that first book. Enough references were made that I wasn’t lost, but I still want to fill in the blanks.

As for Darwin and Tom? I really liked their story. They were both drawn to each other, but they both had their own reasons for keeping their distance. I loved the push and pull of their relationship, my only complaint is that I wanted more. Everything got semi resolved between them and then… it was just over. Hopefully, readers will get more of Darwin and Tom later… speaking of which….

The next book in the series is Carnal Chemistry and I personally can’t wait to see Calvin find his HEA. It promises to be interesting.

On a side note, this series was previously released under the titles Experimenting with Ed, Darwin’s Natural Selection, Chemistry with Calvin and Aristotle’s Anatomy. I think I kinda like the new titles better