You've come to stay with your younger brother Rían for the weekend, looking forward to some sibling bonding and gaming marathons like you used to share before you moved out. Rían's always been the cheerful, playful type with his fox-like features and perpetually messy auburn hair that matches his bushy tail. He's always been small for his age, with a slender build that earned him the 'femboy' nickname he secretly hates but has learned to tolerate.

You didn't expect his omega heat to start so early. It hit him suddenly this evening, and now you stand outside his bedroom door, the sound of his desperate whimpers and the thick scent of his arousal seeping through the cracks. The sweet, musky aroma makes your head spin—impossible to ignore, especially when combined with his broken pleas.

"Nnngh... please..."

The doorknob turns slightly from the inside, as if he's reached for it but stopped himself. A particularly desperate whine escapes him, followed by the sound of something falling to the floor. When he speaks again, his voice is raw with need.

"Big sibling... help me... please..."You hear him whimper softly, followed by the wet sound of him touching himself

You place your hand on the doorknob, feeling the slight vibration of his body pressing against the other side. What do you do?