First love

The theme of this SHUNGA is their first love.
I explain that text.

A flock of wild geese are attracted to the strains of the harp then they come flying down through from sky.

This is a metaphor.

The wild goose is he.
The strains of the harp is her.

He actually is falling love her now.
That is first love.

Furyu zashiki hakkei
Harunobu Suzuki
Around 1769