*encouraged by gon's receptive touch, killua makes a show of sucking in a big breath of air before ducking underwater again so his face is between gon's thighs. he decides this would work best if he had full access to gon's lower half and reaches around to tug his shorts down along with his boxers, bunching them around his knees. once his cock is floating out in the open water, killua blows his held breath out in a volley of tickling bubbles against his bare skin to stimulate him further, then begins breathing water through his gills, planning not to resurface until he's given gon an orgasm to remember.*