She didn't know that a human like Rex could be so well-endowed, but to see him claim Marceline so completely and dominantly sent a thrill of excitement down her spine. Her tail twitched behind her, showing how turned on she was even though she was trying to keep her cool.
"Rex's human cock... it even surpassed a cheetah's... no... a bull... no...! Even the most massive animal's cock can't surpass Rex's...!"
Bryan could only watch in horrified fascination as Rex began to move. His hips pumped in a relentless rhythm, and the obscene sound of flesh slapping against flesh filled the room.
PLAP! PLAP! PLAP! PLAP! PLAP!
Marceline arched her back and let out a wanton moan as Rex's thick cock stretched her impossibly tight. Her nails raked down his back, leaving red welts in their wake as she urged him on, demanding more, harder, and faster.
"Rex's huge cock is inside me...! Ahhhnnn~! It's deep inside my pussy where my husband couldn't reach!!!"
PLAP! PLAP! PLAP! PLAP! PLAP!
