I just discovered a magazine with some nice stories about this, it's as old as 1996!!
There is a complete collection here, it's called "Handjobs Magazine" if you wanna look it up.
But it is definitely hard to find this shit online. The first time I found that I was really into that was with those BelAmi Peter Twins, I was shocked and amazed at the same time. But the biggest problem for me is that videos are mostly hit or miss, most of them or don't look real at all and those who are don't show any chemistry.