As the night fell, I heard the door creak open. My heart raced as my step-uncle, Mark, walked into my bedroom. His muscular frame filled the doorway as he shut the door behind him, silently locking us in together. His eyes met mine, full of lust and desire. He stalked towards me, his footsteps echoing through the room as he stripped down to his underwear. My cock twitched in anticipation as I watched him undo his belt, slowly sliding it down his strong thighs. I licked my lips nervously, my gaze fixating on the bulge in his briefs that grew with each passing second. Finally, he stood before me, fully exposed. My step-uncle's massive cock threatened to burst free from his briefs as it slapped against his abdomen. His deep voice rumbled in the otherwise quiet room when he asked if I was ready to learn about men and women's bodies.
