Sirius would have given him anything.
Sirius wanted to give him a thunderous rainstorm to kiss under. He wanted to give him a treasure trove of delicate glass sugar, an oak shelf heavy with rich, healing chocolate. He wanted to give him all the books under the sun, he wanted their paper-parchment smell to congratulate their love as they kissed. Sirius wanted to knit him lovely home-made things, only he didn’t know how to knit. He wanted to give him all the glittering heirlooms of Grimmauld Place, if only to cover him in precious things as a prince should.
Sirius wanted to make declarations of love made of small, sweet gestures that he knew would be appreciated by his quiet, affectionate Moony.