Welcome to the Oral Service Club

The male lead returns home at night and immediately pins his girlfriend to the bed for raw, unrestrained sex—his huge cock pounding her tight pussy while her cheeks flush red and she squirts with excitement, moaning uncontrollably. He deliberately makes sure his girlfriend's younger sister can hear everything. In the end, the worthless brother-in-law, desperate to pay off his debts, forces the younger sister to work at the oral service club, providing oral service to customers.