You're going to take that paper towel tube you've got there, and your going to put it inside that sock.
Then you're going to loosen the toe end of that sock a few inches, and push those few inches back inside the roll.
Then you're going to take that condom full of nice warm cum and drop it into the toe end of the sock. Lastly, being careful not to let any cum spill out, your going to pull back about half of the condom so that it wraps around the outside of the sock and toilet paper roll.
When it's all done you should have a tube, inside a sock, inside a condom, with a little valley inside one end of the tube holding a nice big load of cum.
Yum yum!