A sudden knock at the door startles me, but it's too late to hide my state. My friend bursts in, feigning surprise, but the mischievous glint in his eyes tells a different story. He's seen everything, from my initial hesitation to my full-blown masturbation. I'm mortified, yet my cock twitches at the thought of him watching me. He smirks, leans against the doorframe, and asks, "Need some help with that?" The room fills with tension, and I'm left to decide whether to kick him out or invite him in for a taboo encounter.