Zaku by Iona Strom

I will have to break every Moktian law to claim my female.

Zaku:
War is imminent on the small, blue planet the humans call Earth. I was only meant to guide the human geneticists toward the answers she seeks to avoid the brewing global conflict. But the more time I spend with the brilliant female, the more my attraction for her grows and the more reluctant I become to erase my existence from her memories.
I should not be harboring tender feelings for a being not of my species, but I find there is no cure for my lack of restraint when it comes to her soft eyes and sexy curves. I should erase myself from her memory forever and return to where I belong.

Ivy:
I assumed I was alone in my endeavors until a late night in the lab turns up an otherworldly visitor I thought lived only in my dreams. His brilliant mind hasn’t been my subconscious thoughts, and his sensual touches haven’t been the product of my wicked imagination. No. He’s real! And he was sent here to help our world.