Sucking wifes breast while she is pregnant

Asalamualaikum Brother.
May Allah SWT blessings be always upon us all.
my wife is 5 months pregnant and feels severe itching in her chest, if i suck upon her , she feels relive as some liquid comes out. Is it permissible in Islam if I suck upon her breast?
would be thanks full for your reply.
Jazakallah khair.
Aslamualikum.

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