duet

When you can spare time from duetting, coquetting, and claretting with your Hibernians of both sexes, let me have a line from you.

Duetting species are typically monogamous.

Peena and Queena are duetting a giggle-for-giggle […]

Oxford University Press, 2012, p. 377

“My dear papa!” duetted the girls; but there was something in the husband and father's face, that told the three ladies it would be worse than useless to raise that question at present.