How did you and your partner integrate each other into your respective friend groups? Do you consider their friends your friends?
My fiance and his friends are big into D&D and other tabletop games, so we have hosted several weekends with many of his friends at our house for hours. We got to know each other pretty well and at one point visited another friend in school in another country together. We've also hosted several of my friends for dinners and other parties, so we're all pretty close now. His friends are also mine and mine are also his. It's a great feeling!