What makes me question the veracity of the video:
1. Blur/out of focus/very low quality :: While not a hallmark of fake, it makes it harder to tell what is actually there.
2. Why didnt he show closer to the camera? When he comes closer to the camera, he hides his 'dick' behind his pants. Maybe nothing, but it's odd.
3. Why doesnt he get hard at all? No evidence of hardness, or anything but the same level of erection. This is a bit odd.
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Individually, they're relatively minor excusable things, but when they're all present, makes me want to 'see more evidence' before coming to conclusions.