Diode with an enabler function
A p-channel MOSFET (source grounded) with a diode in series with the drain will almost perfectly perform your stated function. There is no need of a second MOSFET. 

Your enable will be a negative voltage wrt ground (typically about -2 to -10 depending on the MOSFET) for 'on' and approximately 0V for 'off'. Choose the diode and MOSFET for your desired current, speed etc.