The key to a great lyric is to convey as much information as possible, in as few words as possible.
That line from Kris does that.
The beautiful, short-lived relationship between Janis Joplin and Kris Kristofferson
https://faroutmagazine.co.uk/janis-joplin-and-kris-kristofferson-relationship/
Kris Kristofferson first met Janis Joplin through their mutual friend and folk singer Bobby Neuwirth in the spring of 1970. At the suggestion of Neuwirth, after they played a show together in New York, Kristofferson accompanied him on a flight to Larkspur, California, to the home of Janis Joplin. What was intended to be a short trip ended up lasting several weeks, and whilst staying at her residence, Kristofferson and Joplin became increasingly drawn to each other.