Regardless of Steve’s skill at handling cock, Henry is easily brought to climax given the high sensitivity of his freshly mutated appendage. Steve thought he was free when he felt the cock lodged in his mouth tense up in preparation for release, but is not ready for the sheer size of the load that Henry would unload into him. Steve’s mouth was immediately full of baby cum but it didn’t stop coming. His cheeks bulged and it began to leak from his lips, but before too much could leak out Henry pushed himself deeper into his brother, lodging his cock down the older boy’s throat forcing cum to now surge directly into the boy’s stomach. Steve could feel his body being stuffed with more cum than a dozen men could output over the course of a week and yet the flow didn’t stop. It wasn’t until cum started to back flow up his esophagus did it cease and the tiny but strong hands holding Steve in place released him. The pressure of cum in his stomach and mouth forced his now free head to pop off the now softening cock.
The whole process had left Steve nearly unconscious and he collapsed to the ground where he rested for a few minutes. He would have been there longer had Henry not started angrily crying at being left on the changing table for so long. Getting back to his feet Steve cautiously looked at Henry’s crotch and was relieved to see the huge cock was now flaccid. Henry didn’t make anymore trouble as Steve put a fresh diaper on him with a looser fit than before to properly make room for the massive genitals inside. Steve then brought Henry back to where he had been playing before and got him the toy he had tossed away. Henry then returned to his fun giving no indication that he had just minutes earlier sexually dominated his older sibling. Steve then left Henry for the privacy of the bathroom. Removing his shirt Steve looked at his stomach in the mirror to get a good view of it. To his relief there was no visible bulge showing the absurd amount of super serum enhanced baby cum resting in his system right then. He pressed his hand over his stomach and could somehow feel it in there doing who knows what to him as it writhed around inside him. It felt like it was trying to impregnate his whole body but that was impossible right?
Steve didn’t have much time before finishing getting cleaned up from the experience and when his parents returned. If either of then noticed anything out of place they didn’t say anything so Steve went back to gaming in his room to forget what had happened.