Good son: suggest he should try licking it
From Create Your Own Story
"Like this?" your brother asks as he starts licking up and down your shaft.
You tell him to lick the tip.
He still keeps inhaling your scent as he licks up your precum. He moans lightly as his tongue keeps licking and he jerks his own cock at the same time.
"I am cumming big bro!" he says before swirling his tongue around even faster than before. That is driving you over the edge too. You try to warn him, but your orgasm hits you too fast. Your first shot of cum sprays all over your brother´s face. He tries to say something, but as he opens his mouth you shoot again. Your sperm flies right into his mouth. He swallows all of it and quickly wraps his lips around the head of your penis while still jerking you. You keep climaxing inside his mouth while he shakes slightly from his own dry orgasm.
Your orgasm is long over, but your brother is still trying to milk more out of you. He keeps sucking at the tip of your meat hungrily for a while. With a big ´plop´ he finally lets go.
"So tasty!" he says with shiny eyes while licking his lips. "Please let us do this again soon!"
You help him clean his face and take him to bed before going to sleep yourself.