In the privacy of his room, the soloboy's mind wanders to his aunt, her unassuming demeanor hiding a fiery spirit he's caught glimpses of. He pictures her in those lacy panties, the ones he's been sneaking into his room, the ones now clutched in his hand. His other hand wraps around his cock, pumping furiously. He's lost in his fantasy, her moans echoing in his mind, her scent filling his nostrils. His balls tighten, and with a groan, he comes, his cum drenching her panties, marking them as his, his eyes rolling back in ecstasy.