Talk:Friends/@comment-26457088-20150612010840/@comment-6613158-20150612055549

There is a little heart at the upper left corner of the your dragon's information screen. If you click the heart it will turn blue. This dragon is then selected for Cooperative Breeding.

Every time you start a Cooperative Breeding anew, the dragon selected for that coupling will automatically receive the blue heart. You will have to remember to select another dragon if you so desire or, for instance, have promised a friend you would.