The two girls were gagged and their mouths were taped shut they were restrained and the ropes had knots at every point The knots were rubbing against their private parts

Description: Two girls' mouths were deeply gagged with red gags, then sealed tightly with layers of wide duct tape, eliciting only low whimpers. their hands were bound behind their backs, and their legs were carefully tied with ropes, yet they were still to move forward step by step. they were walking on a specially made tight  rope a rough hemp rope stretched taut, with a bulging, hard knot tied at intervals. the rope clung tightly to their genitals, and with each difficult step forward, the rough knots repeatedly rubbed against their sensitive private parts, bringing waves of intense, inescapable stimulation. the knots scraped against their moist flesh, making their breathing rapid and broken; their whimpering moans were muffled by the gags and tape, turning into suppressed nasal sounds. they were to continue forward, each step causing the knots to squeeze and grind deeper into their most intimate parts. shame and pleasure intertwined, making their legs weaker and weaker, yet they couldn't stop.