As the sun beats down on the boat, Lucas and Mark can't help but steal glances at each other, their lust growing with each passing wave. Finally, they sneak away, their hearts pounding with anticipation. Mark's tiny swim trunks do little to hide his massive erection, and Lucas can't resist the urge to free it, taking the thick cock into his mouth and swirling his tongue around the sensitive head. Mark moans, his fingers tangled in Lucas' hair as he guides the eager twink's mouth up and down his shaft. But he wants more – he wants to feel Lucas' tight ass around his cock. He spins Lucas around, spitting on his hand to lube up Lucas' hole before sliding his cock deep inside. The boat bobs gently as Mark pounds Lucas' ass, the sound of their flesh slapping together filling the air. They switch positions, Mark on his back, Lucas riding him hard, until finally, Mark can't hold back any longer, pulling out to cover Lucas' ass and back in hot, sticky cum.