I found Janet Kagan’s 1991 book ‘Mirabile’ in my library when I was a teenager, and it has been my favorite cozy read ever since. Gentle, good-natured science fiction focused on the biologists and adventurers managing the flora and fauna of a far-future terraformed planet, with lovely characters and an absolutely adorable romance between two middle-aged people. Can’t count how many times I’ve reread it at this point. The physical edition is out of print, but it’s available for around $5 in ebook form, and used hardback copies can be had for a reasonable price as well.