In the throes of a heated argument, siblings find themselves locked in a tense standoff. Words fly, tempers flare, but beneath it all, an undercurrent of something else pulses. As they stand there, chests heaving, the younger sibling's gaze flicks down, lingering on the older sibling's crotch. The older sibling notices, their breath catching as they realize the direction of the younger's thoughts. The air between them shifts, charged with a new energy. The older sibling takes a step closer, their voice dropping to a low growl, "You shouldn't look at me like that." But the younger doesn't back down, their eyes meeting the older's with a challenge, "Why not? You're all I think about."