In the dimly lit chamber, Master, clad in leather and adorned with silver chains, surveys his realm. His eyes land on Slave, bound and kneeling, awaiting his command. Master strides to Slave, brandishing a sleek, black frustra, its handle cool and smooth in his palm. He traces it along Slave's spine, drawing a shiver. "Beg," Master commands, voice low and steady. Slave, eyes downcast, whispers, "Please, Master, use your frustra on me." Master smiles, running the toy along Slave's back, down to their ass, pressing it against their hole. Slave gasps, arching their back. Master chuckles, "Good slave."