【同床异梦】〖tóng chuáng yì mèng〗[sleep in the same bed but dream different dreams; Bedfellows are having different dreams -- differences in opinion and ambition; be thrown together but each having a different problem; hide different purposes behind the semblance of accord]

同功一体实质迥，

床笫之私别心生。

异闻传说风流韵，

梦往神游去偷情。