Big-Titted Step Sister Teases with Her Panties

I couldn’t help but stare at my step sister’s huge tits as she bent over, giving me a perfect view of her cleavage. But what really got me hard was when I noticed the wet spot on her panties. She must have known I was watching, because she started slowly rubbing herself, teasing me with the sight of her damp underwear. My cock throbbed as I imagined what lay beneath that thin fabric.