Those delightfully colourful bubbles, the ones that spell out the word EXTEND when collected, are of incredible value to a Bubble Dragon. When enough are burst to spell the word, their lifespan is extended and they can continue further on their journeys.
When consumed, however, it causes a far more intense effect. Just one letter can make them cum non-stop anywhere from five to ten minutes in a constant haze of mind-numbing pleasure.
When you have one Bubble Dragon who is significantly more dominant than the other, this can in turn lead to fun games between them~
This particular game is called "Burst the Bubble" >:3