As the darkness deepens even further; you let go of your fear and let the arousal of something so twisted and macabre fully fill you. You can feel your cock throbbing as the needles pierce into your flesh; you can feel new needles even piercing into your ball sack; you can feel them piercing your back and the blades flaying your flesh and stitching it back on like a suit. You can feel yourself changing too; getting bigger; harder; and grinning with lustful malice you wait patiently for the magic box to finish it's work. Surely enough the needles and blades and tubes all pull away from you and the box opens again letting the light of your room pour in. The young green haired boy appears to be sitting on your bed; watching for you as you come out of the box. You can't see what you look like completely; your hands are great clawed things; your skin appears to be stitched together like frankenstein's monster. You approach a large mirror in the corner of your room; feeling the thud of your steps on the floor. You can see yourself and indeed you look a great deal like the frankenstein monster now; only with lusher hair; and visibly bestial golden glowing eyes. You have claws and your mouth is rowed with sharp teeth; and you are visibly a great deal taller than before; you have to lean down a bit not to hit the ceiling with your head.
Your cock looks a bit like a tree trunk now; thicker and longer than even before; you feel like it would probably be as long as your arm now fully erect; and it couldn't possibly fit into the young man's opening. You need to fuck him though; you need to full him; everything you felt all that pain and agony so exquisite was something that you had to reward him for. You needed to give him your juices; your milk; you lunge for him without thinking; roaring like a beast; needing to fuck him to death even if you could.
The young man flips from the bed though and with a few gestures points to the box before smiling your way; you turn to see the box begin to transform.