My Husbend's Penis Is Very Small As Compaired To My

My husbend's penis is very small as compaired to my friends penis. During sex time he fall down very soon. And i have do to fingering or wait for next days for my friends.
Tell me what to do for long lasting on bed and how to get big and broad penis of my husband only.
I feel very bad to be fucked with someone else. Plz help me for my married life.