But from somewhere , warmth . He stopped for a moment , still several feet from her , and tested the water on all sides . They were in a pocket that was at least ten degrees warmer than the rest of the lake . He thought of vengeful ghosts leading him deeper to pull him under and shook his head as if to clear it .
“ It ’ s the overturn ,” she said without turning to look at him .
“ What ?” he asked , moving closer until he was standing behind her . She felt his breath on her neck and shivered .
“ The water is warm because of the overturn . When the surface temperatures cool down , that water sinks to the bottom of the lake . The warm water from below rises up ,” she said , turning to face him finally , “ in a cycle that continues until the surface freezes . In a month we can go skating out here .”
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“ How do you know that ?”
“ I know lots of things ,” she said softly . He felt her hand on his stomach , her nails scratching lightly across his lower belly . His cock twitched in anticipation , but she didn ’ t touch him there . Instead , she turned and dove again . He swam after her , letting her lead him closer to the trees .
“ You ’ re a better swimmer than I thought ,” she said when they surfaced . Crystalline drops of water formed on her shoulders .
“ Are you sure you want to stay out here ? It ’ s awfully cold .”
“ I like the cold .”