In a post-apocalyptic Boston, a lone survivor stumbles upon a hidden vault filled with horny, irradiated inhabitants. As he explores, he finds vault dwellers engaging in every kinky act imaginable, from Vault Boy's massive, glowing cock to the power armor-cladstitute's raunchy roleplay. The survivor joins in, fucking his way through the vault, until a sudden Pip-Boy alert signals an approaching horde, forcing them all to put their libidos on hold.