Casey, intrigued by Zach's huge black cock, can't resist the urge to touch it. He wraps his hand around the thick, pulsing shaft, marveling at the contrast of their skin tones. Zach's low, guttural moan spurs Casey on, and he begins to stroke, his grip tightening as Zach's cock grows harder. Casey's curiosity turns to lust as he feels Zach's massive dick throb in his hand, the head leaking pre-cum. He leans down, tentatively licking the tip, tasting the salty fluid before taking the entire length into his mouth, eager to explore every inch of Zach's cock.