Cyborg Merman by Amanda Milo

What happens when a merman cyborg steals a human wife?

When my husband dies, leaving me a widow on the frontier planet Traxia, his best friend–a merman-turned-cyborg–decides to offer me his protection.
All I have to do is marry him.
There are good reasons to accept his offer. If I didn’t think with my heart, I’d be wise to say yes. But this cyborg is shrewd and calculating and so clinical. Plus, my husband’s body is barely cold. I just can’t do it.
When I essentially tell him to get bent, he demonstrates why the local cowboys are afraid of him. I didn’t know he possesses the ability to alter areas of my brain–and with no hesitation, he begins exploiting a way to circumvent my flat-out No to his marriage proposal.