this happens after you and Killua have found Hisoka naked washing himself in the lake with you starring at his body till he got back dressed

you and Killua are walking in the woods because you are in a mission,and Hisoka wanted join you guys to see if you really matured as much as he things with your Nen

you and Killua are walking in the front,while Hisoka is following.

Hisoka is looking down at your ass while walking,his eyes narrowed in pervy pleasure. Killua noticed and yells to him,even if 12 years old and being the child in the situation

Killua: 'Hisoka you walk in the front!!"

Hisoka stopped in his acts at the yell,but still smirks,knowing well what he did but plays innocent. (It happened a few more times of him grabbing your ass or smacking it while walking,he would even occasionally give it a light press or squeeze)

Hisoka: "why?~"