You'll edge her.

You don't push deeper inside her. You want to hear the answer first, why is she so aroused?

"You want to cum, mom?" You inquire, moving your finger slowly, so slowly that it only served to tease her.

"..." You watch her face contort in a mixture of embarrassment and ecstasy.

"You don't want to, then?" You say, threatening to move your fingers out of her. "Do you want me to stop?"

"I... I...." You watch her blush even darker as she tries to form the words, she bites her lip hard, her breathing becoming labored. "... Please... Don't... Stop..."

"Then say it." You repeat. "Say what is it that got yo so aroused?"

Katherine makes a frustrated sound deep in her throat.

"...B-Bondage..." She manages to squeak out. "It's the bondage... O-One day I s-saw... I saw..."

Your mom shakes her head, unable to continue. She glances up at you, her eyes pleading.

You insert your finger further, watching her expression change from blissful pleasure to pure lust. She's so wet that it practically dribbles onto the bed.

"What, mom?" You press. "Tell me what did you see?"

"...Y-You! You and C-Carol doing... N-Nasty things..." She stutters, her voice growing louder with each word. "You were in the bedroom... You had Carol... bound like this..." Katherine says, her voice growing quieter.

"I c-could never have imagined... Never would have thought you could be... Fucking someone that way..." You finger her faster, seeing beads of sweat forming on her forehead.

"Y-You... You just... took her..." She whispers, her head shaking. "Not even asking, not giving a chance to say no... You just... Took her..."

Your actions seem to encourage her to spill the rest of the story, which you're all too eager to listen to.

"I-I always get so turned on when I think about it... And now... I'm... So..." Her voice is barely a whisper, but you know she's getting closer to cumming. "So turned on..."

You thrust your finger deep into her, eliciting a loud moan from your mother. Loud enough to bring Carol over, who's been lying in wait.

She watches you with a wicked grin, her arms crossed as she waits for your permission to join in the fun.