Mistress cuckolds her sub in the boxing gym for a hot load

She grinned knowingly and then shrugged in resignation. Sex video “Okay, but not like that.”
“What do you mean?” she said suspiciously. He felt his penis stiffen as his young niece’s bottom squirmed against him. “It was an innocent kiss,” protested her uncle, “there was nothing incestuous about that.”
“That thing in your trousers isn’t innocent,” she said boldly, “I felt it press into me.”
“It’s not a thing, it’s and erection and you can’t tell me that you’ve never felt one before.”
“Of course I haven’t,” the flustered child blushed more deeply. “Do you promise? “Not even a little bit?” he persisted. “I meant, if you wanted to, you know, to see what it feels like.”
Her pulse raced at the thought but she hid her excitement.