Color the ocean red (to prove my love to you)

"-Give it back!"

The toddler stomped the sand as the mer stretched his hand further away, out of reach for the upset kid.

"-Hmmmmm...How about, no."

Shanks throws the ball up in the air just to catch it back with his hand, watching the pouting toddler with a taunting smile.

Luffy could only watch as the mer held captive his beloved beach ball.

'This is too easy. I can't wait to hear the symphony of gurgling this snotty nose brat will make as I drag him under the foamy waves to the bottom of the sea.' Glee sparks in red eyes at the mental image.

Or Shanks is a probably (definitely) murderous mer. Luffy has no self-preservation instincts and goes "You are my friend now" and it's getting worse before it gets better

Or or Author craves Shanks and Luffy brotherly fluff fics and decides to make their own.