Just kind of an intense reaching for the other's hand moment. When I made it I was kind of thinking of the song "I Will Follow You Into The Dark" by Death Cab for Cutie. Like they're taking each other's hand to symbolically the fact that they're committed to each other for the long haul.
Also perhaps remniscent of the ceiling of the Sistine Chapel the way their hands don't touch and they're just so concentrated. Similar in idea and not in implication.
It is entirely possible I thought about this way too hard ;)
A Master List of my Manips can now be found through a link in my profile or by CLICKING HERE. (There's a variety of ships, het and slash, a couple of different shows, and it will be updated on a consistent basis)