The September air is thick with tension as a brother and sister find themselves alone together. The brother, a strapping young man, can't help but notice his sister's growing curiosity. She's been stealing glances at his crotch, and he's been responding in kind, his cock swelling in his jeans. One day, as they're sitting close together, she reaches out and touches him, her hand lingering on his bulge. He freezes, but she doesn't stop. She rubs him through his jeans, feeling his cock grow harder and longer. He looks at her, his eyes filled with lust and fear, but she just smiles and whispers, "It's just you and me this September, big brother."