18-year-old stepsister pleads for orgasm as I stimulate her wet underwear

I'm not sure what it is about 18-year-old girls that just makes me weak in the knees. Maybe it's their innocence or their tight, wet pussies, but I can't get enough of them. In this video, I catch my stepsister pleasuring herself in her panties, her hands making quick, desperate movements. She looks up at me with pleading eyes, silently asking for help to reach that elusive orgasm. Being the good brother that I am, I can't resist helping her out. I take over where she leaves off, my fingers exploring every inch of her wet, hot pussy. The sight of her writhing in pleasure is enough to make me rock hard, my own orgasm building with each moan and shudder from her. As I continue to pleasure her, she finally reaches that peak, her body convulsing with the intensity of her climax. The sight of her cum glistening on her panties is enough to make me cum as well, my own release joining hers in a testament to the power of teenage lust.