Jay looked at the settings on the Chronivac. A small screen showed the possible options. He wanted to make Jay's cock even smaller. The screen showed a different option every time Jay pressed the menu button. The options went down to little boy, baby, fetus and finally...girl.
Jay frowned at that last option. Girls don't have cocks, do they? It made a kind of sense. A clitoris wasn't called a cock, but that was kind of what it was. Jay selected the final setting, pointed the Chronivac at Sean and pressed activate. Sean was in such rapture, he didn't notice Jay using the Chronivac. Sean's cock shrank still further, smaller and smaller until it seemed to disappear into a fold in his crotch.
Now Sean had the smallest cock of all. A girl's cock!