their meetings remained brief courtesy encounters , drawn out into reruns of his fantasies , with slight variations in the script : clarissa riding the bicycle on the wet cobblestones of the campus , wearing nothing but the broken chain dangling around her ; clarissa holding a naked presentation in the lecture hall with a pointing stick , with him seated in the first row and everybody else locked out ; clarissa naked in the library , wearing only a pair of spike heels and a leather bookmark , like a pageant sash , ascending the top step of the ladder to reach a cryptic volume .