In the privacy of his room, an eager amateur explores the delicate art of CBT. His cock stands at attention, throbbing with anticipation. He begins to stroke, slowly at first, then with increasing fervor. But it's not just pleasure he's after. He takes his balls in hand, gently at first, then with more pressure, testing their limits. He moans, a mix of pain and pleasure, as he continues to stroke and tease, pushing himself further than he's ever gone before.