Run two graphic cards in SLI with a parallel power circuit

I bought a new MSI Z97S SLI Krait mainboard with two PCI-E slots.

Because i bought a GeForce GTX 770 MSI OC two years ago, I bought another one very cheap to let them run in SLI mode.

But i discovered that my power adapter has only 2 PCI-E power slots..

Is it possible to double the PCI-E Power (via a parallel circuit, a Y-Splitter like this) with this PSU: Sharkoon WPM (700W) without any risk of damaging one of my components!

Thanks in advance ;) (SFMBE)