He needs to pee
From Create Your Own Story
Daniel lays there, suckling more sweet milk from his new wet nurse, his legs draped over the sheets of the bed. His eyes drifted to his new milk-sibling, the content look on the black-haired boy's face as he was on his knees as if he was begging for it. He wore a blue-onsie, the leak-guards of his diaper bulging through the leggings.
He could not help but notice the seat of the boy's diaper was suddenly expanding; he was pooping his diaper while he was eating and did not seem to notice. That was when he thought back to his diaper and felt his own diaper becoming warm. He just then started to pee his diaper like a baby. I'm not a baby! He thought to himself. While he was still hungry, he tried to pull away, only to suck on the breast harder, almost as if he was compelled too.
He felt his diaper swell, his pee filling the fibers of his diaper until it slowed down to a trickle.