Alien Desires. Lovable Aliens, #1

An alien crashes on Earth and discovers love. Annie's anger and an icy walkway put a medical boot on her foot, forcing her to rely on her brother for a ride home. When he accidentally hits a giant of a man, she wants to call for an ambulance, but the phones are out and she finds out her brother's license is suspended. The man doesn't appear to be badly injured and her place is close, so they take him home.
But man, what a hunk! If only she'd met the hot stranger anywhere other than at the end of her brother's bumper. Calix is from a planet that is in the path of a comet. Normally a teacher, his mission is to discover if Earth would accept his people. But his ship isn't working, he's injured, and he's not sure what to do. His urge to confide in Annie is overwhelming. He's never had feelings like he's experiencing.
Is it an effect of Earth's atmosphere-or is it just Annie? Annie has a hard time believing Calix is an alien because he looks so.human. Then he shows her his spacecraft. Of all the people to fall for, she goes and picks an alien. A hunky alien, but still.  How can they stay together and keep his people from taking over Earth?