Sisterly love

Can I make you a sandwich, my sister asked.
I would have been about twelve and always hungry, my sister going on fourteen and mostly annoyed with me and not prone to attacks of sisterly love, but, hunger overcame suspicion and I ate the sandwich while my sister stood by and watched.
Why? I asked when I had finished the sandwich, why did you make me a sandwich ?
Well, she said with disarming honesty; I feel that I am getting fat and I thought if you were fat too, then nobody would notice.
No sisterly love here, just pure vanity.
But then she was going on fourteen, never an easy time.
And the sandwich was good.