1. 'Fortune' is presented as a 'wind', or 'breeze', that brings good things to the speaker.
2. Breezes bring us the scent of flowers.
3. The mother's caress is associated with her characteristic smell of scent or perfume.
If we put these together:
'When the wind of Fortune brings good things to me, it brings also the memory of you, like the smell of flowers.'
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