Good son: let your brother continue
From Create Your Own Story
Your brother continues to lick the tip of your cock. He licks up all of your precum. His small fingers grab your shaft and he begins to lick up and down your length. Every time he comes back up to the head of your penis he wraps his lips around it a little bit and slurps up the pre cum you are producing. He moans slightly every time he gets to taste it.
