Yes

John's miniscule member was completely incapable of withstanding even the slightest of touches, let alone rubbing on the lap of his mother while she spanked his bare ass.

By the time her next spank struck him he was dribbling cum all across her legs.

His sister's eyes grew wide when she realized what her twin had just done, "Woah John, did you just cum from a spanking?"

John's legs were shaking from pleasure and humiliation, unable to think of any response or excuse for his "performance".

His mother had a look of disgust on her face and he knew his next punishment would make this one look tiny, for lack of a better word, in comparison.