Reyzon by Lena Grey, Juno Wells

On Earth, 12 female college students board a starship for A Year of Interstellar Education. Crashing on a primitive planet inhabited by barbarian aliens was not on their itinerary…
There are worse things than being worshipped by a Rakui, right?
You know the old saying, ‘No good deed goes unpunished’? Turns out, it’s true. When Alana and I try to rescue our college students from a primitive planet, our plan backfires. Now we’re stranded on UD237 with the girls and Earth Gov has turned us into test subjects, too.
And that’s not all. Reyzon, the giant, golden alien who saved my life, says I’m his mate. How can I be the hot barbarian’s mate? I’m a nerdy introvert who’s never even had a real boyfriend.
Reyzon tells me he’s a patient male and will wait for me realize what his heart already knows: that we belong together forevermore. I don’t want to disappoint him, but I’d rather study the Rakui culture than settle down and start a family.
Until a single kiss that leaves me breathless changes everything.