Zenitsu's massive cock throbs as he watches Nezuko's big ass sway, her tight asshole winking at him. She teases him, running a finger along her slit, then pushes it into her ass, moaning loudly. Unable to resist, Zenitsu grabs her hips, his big cock sliding between her cheeks. He grinds against her, pre-cum leaking onto her skin. Nezuko reaches back, spreading her ass, and Zenitsu drives his dick into her asshole, fucking her hard and fast, his balls slapping her clit, until they both cum explosively, their bodies shaking with pleasure.