The Last Number

Zoe and I often have this conversation:

Me: I love you.
Zoë: I love you too.
Me: I love you three.
Zoë: I love you ten.
Me: I love you fifty.

And on and on with escalating numbers including multiple googols and petabytes.

But I think Zoë trumped me once and for all the other day when she said:

I love you the last number.