Se um Feiticeiro de 6º nível com Afinidade Elemental (fogo) lançar Lâmina de Chama Verde, é apenas o dano do primeiro alvo aumentado ou ambos?

Afinidade elementar:

[...] when you cast a spell that deals damage of the type associated with your draconic ancestry, add your Charisma modifier to that damage.

Lâmina de Chama Verde:

[...] the target suffers the attack’s normal effects, and green fire leaps from the target to a different creature of your choice that you can see within 5 feet of it. The second creature takes fire damage equal to your spellcasting modifier.
[..a]t 5th level, the melee attack deals an extra 1d8 fire damage to the target, and the fire damage to the second creature increases to 1d8 + your spellcasting ability modifier.