Whatever your partner's important work may be, it gets a boost through their relationship with you. You cheer them on and bring a level of enthusiasm to their life regarding their work that they might not be able to drum up on their own. What a great benefit of a romantic connection, when it can extend to at least one of your careers!
You help this person to be more dynamic in their work efforts; you inspire them to roll with the punches, to change their techniques when need be, and most of all, to push forward constantly. After all, you can only achieve success if you try -- if you really apply yourself. There's something to be said for long hours and dedication, but there's also plenty of value in a burst of energy and creativity, in tackling your work with passion. And a healthy competitive edge never hurt anyone who was trying to achieve their ambitions! This relationship brings all that and more to each of you, but especially to your partner. You support them by being their best teammate. You both have a lot of passion about your work that is only enhanced by this aspect, and by your connection with each other.