For the Eight: make room for play. Not efficiency, not output, not strategic relaxation — genuine, unproductive, delightful play with your Three. The Three's joy is not a bonus feature of this relationship; it is a necessary element that sustains both of you. When you create space for it rather than managing it, you will find that the Three's energy, creativity, and affection for you increases substantially. Also, practice saying what you feel — even briefly, even awkwardly. Your Three needs to hear it.
For the Three: build some financial seriousness, not because it is inherently important but because it matters to your Eight and because genuine partnership requires engagement with all of shared life, including the parts that are not naturally exciting to you. Show up for the money conversation, the annual planning, the insurance renewal. Your Eight will feel deeply supported by your engagement with these domains, and that support will free them to be present and generous in the ways that matter most to you.