Ministry of Alien Relations by Rebecca Cohen

Devlin Taylor is Head of Settlement and Relocation for the British Government’s Ministry of Alien Relations. He’s more used to helping recently arrived aliens find new homes and pay their utility bills than babysitting extraterrestrial socialites, but he’s been assigned to look after Zal Catenmir, son of the Chroalian ambassador, during their diplomatic visit to Earth.
Devlin is the perfect host and tour guide, and Zal loves the fuzziness of human males, while Devlin can’t seem to get enough of Zal’s scales and tail. But with only two weeks together before Zal leaves, they need to make the most of their time.

Zal was just out for a bit of fun, trying to relive his wilder youth after a break-up, but Devlin is wonderful and they both wish they could find a way to stay together. The Earth Ambassador Programme is under development, but it doesn’t look likely Devlin will get the job, and the lovers may need to say their goodbyes forever.