Kyle keeps staring at his dick, which hasn't softened from his recent orgasm. In fact, he is still horny, and growing more and more so as the minutes pass. It's almost as if someone was slowly turning up the volume on a stereo, amping up his arousal with every passing second.
Kyle can feel his testicles growing heavier. He can see his penis twitching with each beat of his heart, throbbing and swelling. Swelling it is, as with each heartbeat, he can see a small change in size. He is growing with each beat of his heart, and every breath.