"Ahhhh!" You feel their body tense up as they orgasm, their muscles tensing and relaxing rhythmically around your cock as they release themselves into your mouth. Their juices coat your tongue and fill your mouth, making you moan in pleasure around them. They collapse forward onto your chest, still panting heavily from the intensity of their climax.
"That was... incredible," they gasp out finally, running a hand through their sweat-damp hair. "I can't believe I just did that..."