Hi User10,
I can try
We are (can also mean 'will be') forever together like two hands on one tummy / stomach (not the organ, but the region on your body).
Like AspieBrain said, 'two hands on one stomach' is an expression; it means something like two people who always think the same about something, who always support what the other one is saying about it. It is not really used in the usual way in this request so I think AspieBrain made the right decision in not finding an equivalent, but giving the literal translation.