Identical twins, identical grins.

They'd make perfect human book-ends dont'cha think? Just imagine a miniature of them at each end of a shelf, with a mini-you as the books in between, one with his cock thrust down yer throat like a garage petrol-pump nozzle giving you a fill-up, the other with his cock rammed to the hilt up yer bum like a sword at home in its scabbard. And when they start their pumping motion it's gotta be in unison with their ins and outs co-ordinated like a concertina, otherwise there's not the required friction. But nice, eh?