In the dimly lit dungeon, Biro, a young teenager, is bound and blindfolded, their heart pounding with anticipation and fear. Tesla, the enigmatic dom, circles them like a predator, a simple biro pen in hand. With a sudden, sharp strike, Tesla brings the pen down on Biro's flesh, marking them with a crimson line. Biro cries out, their body arching, as Tesla continues the sadistic symphony, each strike bringing them closer to the edge of pleasure and pain.