[quote=IVIasterJay]
Pool table? Mars' nen ability should be a dead giveaway that he's stupidly good at games like marbles and pool. Mars: (/^_^)/ "Ivy~, wanna play a game~? If I win, you have to leave your door unlocked tonight~<3. If you win, you get to punish me in any way you want~. It'll be fun!"
[/quote]

Ivy being a mob child she has some experience with games like pool and would be confident in her chances 
Ivy: >:D "You on Psycho" -Loses- "Damn it"
Later that night you go to open Ivy's door only to find a 7 foot tall raven nen-beast on the other side to great you and block entry while Ivy sleeps peacfully