Default Shipping address

New Member
1 0 0

I've been trying to get a default shipping address on the checkout. I have a wishlist app (wishify) where several people have made a list with on my website.
They're hoping to keep their own address secret as it's other people buying the items for them. Would love to be able to set something like that up. Customers privacy is important to me and want them to be happy. 
So it's only for when others purchase not when I'm shipping to them. 

Thanks in advance