Dan smiled at the feeling of all that cum churning in his balls. They felt so full, it felt so good! He wanted even more. His gaze, infected by lust, turned to the bottle of salve he'd just used and he knew what to do. Taking the bottle he sprayed his balls all over. They shone with a sheen of the substance before it started to sink into his skin.
He felt the change immediately. Once more the heat built in his body as his balls start to swell. Still full from before his cock started to spurt more and more cum against the wall. It lasted longer this time but to Dan it felt like an eternity of pleasure as he moaned, came, and struggled to stand as it all happened.
Once all was said and done and he regained his senses, Dan looked down and smiled deviously. His already big balls had gotten bigger. Now each was the size of a basketball, capable of holding so much and producing it just as fast. Holding his cock in hand he was easily able to stroke himself to orgasm, shooting nearly two litres of baby batter onto the floor. His room stank of cum. He planned on having even more fun when he heard someone return home.