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When snakes begin to pour in through the walls Dean freezes, face a rictus of fear, eyes darting between the roiling mass of vipers and the massive anaconda waiting its turn in the corner.
The sound of sliding scales is deafening and serpents blanket Dean as he crashes to the floor. Sam holds Dean in place as a snake slithers into his mouth- another blunt head probes between his legs, pushes in. Sam lets the snakes have playtime then it’s his turn. Hundreds of fangs pump venom and Sam groans as Dean convulses in agony, muscles tightening around his cock.