*kalluto begins to move, and for a moment killua is fully engulfed in the rush of feeling another body squirming beneath his, his nerves flaring at all their points of contact. his shirt has ridden up, and the slap of their bare skin as his brother jerks their hips together ignites a flame in his belly that sparks as their lips brush. it continues to glow inside him as he opens his eyes, heaving himself up on shaking hands and knees to look down at his limp brother beneath him, blinking in wonder at what they've begun.*