Ensnared By the Rabbit Genius by Delaney Rain

Ellis Cole is an FBI research analyst assigned to observe a giant white rabbit while he’s on Earth. Wherever he goes, Ellis must follow. Never told to be covert about it, Ellis finds the only way for him to keep up is by slowing his bouncy bunny down. Getting naked wasn’t part of the plan, but it seems to be working.
Commander Seiwa Heremond is an engineer tasked with getting human technology up to Norlon standards. An easy task, right? They’re only about a century behind. And then Seiwa discovers his mate is the human man who keeps following him around. Might Ellis follow other directions? He’s too irresistible not to try.
With the FBI making demands for new tech, and NASA begging for anything at all that the Norlons will provide, Ellis is determined to help all humans everywhere benefit. But what would help every single person on Earth for free?