Velcro? In a chastity cage?? Wow, what an evil, sadistic guy you are! (Um, I mean, yup...you got it, that's exactly what I did with him. I guess I can be a sadistic guy too?) ;-)  It was pretty entertaining too...he thought he could cum that way, so he tried to...then got super hard, but every time before he could get far enough he would feel his dick pressing into the spikes at the end of the chastity cage again, and go down a bit. Rinse and repeat, a vicious cycle!