Show her something new instead.

"You mean fingerfuck you until you cum?"

You pull back a little, tilting her head up with your hand to make her look you in the eye.

"Yes..." She blushes furiously and can't meet your gaze for more than a moment.

"You don't want me to fuck you with the strapon instead? You seemed to enjoy that quite a lot." You give her knee a squeeze to let her know you're just teasing her.

"No... I mean, yes! I mean I liked that too but I wanted to feel... you..." She finds your hand, her fingers intertwining with yours.

"I see." You kiss her, sliding your hand down her body, between her breasts, over her trembling midriff to her soft mound... and stop, making her whimper in frustration.

"How about... I show you... something different..." Each kiss is hungry and deep. "I promise... you'll like it..."

"Okay auntie... anything you want..." She's breathless now, eager and willing.

You slide her off your lap to lie on her back on the couch, then kiss your way down her body while your hands slide up and down her arms and flanks. Starting at her lips you continue down her neck, her collar bone, down to one breast where you linger a while, licking and sucking her nipple, then down her stomach to her mound. When you glance up at her face her eyes are closed in that concentrated look you're starting to know quite well.

You're down between her legs now, feasting your gaze on her beautiful pussy. Under that pronounced mound with it's thin patch of darkish hair her labia are small and very pink, glistening with her juices, already open for you, her clit peeking out of it's hood.

When you put your mouth on her she gasps and pushes her hips up against your face.

"Oh! Oh auntie!"