While I lack an IJ to make a proper comment, I had to leave one regardless:
This was all kinds of utterly, fantastically marvelous!! I adore the AD/GG pair, but tentatively approach their characterizations as they've been appearing in recent fics... but here, they were both perfect: charming and smart and young. Gellert was a perfect ray of kinky, heliocentric sunshine and Albus was still a sapling, growing into himself and guileless and full of potential energy. *leaps about in glee*
Also; the flower-bondage was excellent. And the bird-helpers at the end. And just about everything, really.