Fallen Angel 2: Descending (1998)

Alex Stone is guided to a subterranean cavern. In this darkest erotic netherworld imaginable, a barrage of fevered leathersex lays claim to his soul. On a tower of steel pipe surrounded by flames, gagging slaves choke on extra-thick, extra juicy cock-slabs, while tight, meaty asses are slammed by brickhouse bruisers. Groveling, moaning pig-boys are trained or sternly roughed up, and the Master's whip is fast and unsparing.