Ask her to continue

"Do it. Suck it, please." You beg.

"No...I shouldnt." She says looking up at you. "I....im your aunt....and your uncle, Im not going to cheat on him."

She lets go of your dick then. You catch hold of it instinctively and notice how soft its becoming, so you begin to stroke it again.

"Stop that already" she says disgusted. "Why did i let it get this far?"

"You liked it. Thats why." She doesnt say a word. "And you still want it too. But you're too scared. If you want, just close your eyes and pretend its someone elses cock."

She looks away nervously.

"I wont tell anyone." You say, turning her face back to your cock. "You dont have to say anything. If you want this, just open wide."