This is clip 2 (of 2) from "Dungeon Weekend for Secretary Lorelei". Lorelei has been re-bound into a frogtie. All she's wearing now is her silky underslip, hose, heels.... and a tape-gag. It looks like preparations are being made because there's a chair nearby with a vibrator tied to it. Next we see that Lorelei has been secured to the dungeon chair. Her captor stops by to grope her and expose those ample breasts, then switches on the vibrator and leaves her by herself. Lorelei squirms around the seat trying to get away from the vibrator, but it just isn't possible, so eventually she gives in and orgasms.
This is Part 2 of 2, from the "Busty Usherette Bound and Brought to Orgasm" story.
By this point, Lorelei has lost all of her usherette uniform except for her hat, and she's clad only in her red silky chemise. Lorelei's pushed onto the bed where the masked man ropes her into a frogtie, then uses a vibrator to bring Lorelei to orgasm. Afterward her captor adds a rope and leaves her there... she can do nothing but mmph plaintively and squirm ever so slightly. - - Video verite'. Videocamera motion at times.