I hope that thread I posted for you to read eased your mind bro 
It only takes a slight movement to slip into a vein. Im not sure where you pinned on your ass but make sure its always top outside...this rarely happens as well. I also aspirate about 5 times while im pining just to make sure
It only takes a slight movement to slip into a vein. Im not sure where you pinned on your ass but make sure its always top outside...this rarely happens as well. I also aspirate about 5 times while im pining just to make sure