She starts it for him

Mia took Adam’s phone while he was still standing over her. His cock rested against her shoulder, heavy and warm, the head leaving a faint wet mark on her skin. She unlocked it and opened Instagram.

Melissa’s profile loaded. Mia scrolled.

There were the usual posts. Brunch. A gym mirror shot. Then, three days ago, a photo that was almost a thirst trap. Melissa on her bed, on her stomach, wearing nothing but a thin black tank top and panties that had ridden up. The angle showed the full curve of her ass. The caption was short: “Can’t sleep.”

Mia’s cunt clenched. She felt Adam’s load shift inside her, a slow warm leak against her thigh.

She opened the DM thread. Empty. She typed.

Adam: That post was unfair. You know what that does to a man who’s already thinking about you.

She sent it. Then she set the phone on the bed between them and wrapped her hand around Adam’s cock again, stroking slow while they waited.

The reply came in under four minutes.

Melissa: Thinking about me how?

Mia glanced up at Adam. He was watching the screen. His cock twitched in her fist.

Adam: The way your ass looked in those panties. Like you wanted someone to pull them to the side and fuck you until you stopped posing.

Melissa: You're pretty bold for a married man.

Adam: You didn’t post that for your followers. You posted it for someone who would notice. I’m noticing.

Melissa: And what exactly are you noticing?

Adam: How easy it would be to get my hand under that tank top. How you’d sound if I pushed those panties aside and put my fingers in you while you tried to stay quiet. How wet you’d get once you stopped pretending you didn’t want it.

Melissa took longer this time. Almost two minutes.

Melissa: Does Mia know you’re texting me?

Mia’s hand stilled on Adam’s cock. She looked at him. He nodded once.

Adam: Does it matter?

The reply was faster.

Melissa: No.

Adam: Then stop asking. Tell me what you were thinking when you took that picture.

Melissa: That I wanted someone to walk in and fuck me like that. Face down. Ass up. No talking. Just hands on my hips and a cock in my cunt until I came.

Adam: I'd love to do that.

Melissa: I’d let you do more. I’d let you hold me down and make me take it until I stopped thinking about anything except how full I was. I’d let you cum in me and then make me stay like that so I could feel it.

Mia’s fingers tightened. She stroked Adam faster, thumb sliding over the wet head on every upstroke. Precum beaded and smeared across her knuckles.

Adam: You’d let me fuck you while my wife was in the next room.

Melissa: I’d let you fuck me and then go back to her with my pussy juice still on your cock. I’d let you kiss her after. I’d let her taste me on you.

Adam: You’re wet right now.

Melissa: Yes.

Adam: Touch yourself. Tell me how.

Melissa: Two fingers. Already inside. I’m soaked. I keep thinking about you pulling my panties to the side and just pushing in. No warning. Just your cock stretching me open while I try not to make noise.

Adam: I’d let you make noise. I’d fuck you until you couldn’t stay quiet. Until you were moaning into the pillow while I held you down and used your cunt like it was mine.

Melissa: Do it then. Come over. I'm wet and alone.

Adam: Not yet. First you keep answering. First you tell me what you want me to do to you the next time you’re in my house.

Melissa: I want you to wait until Mia leaves. I want you to come to my place. I want you to bend me over the bed and fuck me from behind until I cum on your cock. I want you to stay inside me after. I want to feel your cum dripping out of me while you get back to her.

Mia leaned forward and took Adam into her mouth. She sucked him slow, deep enough that the head pressed against the back of her throat, while her eyes stayed on the screen. He groaned low and threaded his fingers into her hair, not guiding, just holding.

Adam: You’d walk around with my load in you. Even if she was in the next room? Knowing she has no idea her stepsister is full of her husband’s cum?

Melissa: Yes. I’d let it leak. I’d sit across from her at dinner and feel it. I’d look at you and know you were thinking about how I felt when you were inside me.

Adam: And if she found out?

Melissa: Then she’d know. And I’d still have gotten fucked by you. That’s enough.

Mia pulled off with a wet sound. A string of spit connected her lip to his cock. She typed with one hand.

Adam: Goodnight, Melissa.

The reply took thirty seconds. Then a single-view image notification.

Mia opened it.

Melissa was lying on her back in bed. Her top was pushed up under her tits. One hand was between her thighs, fingers buried in her cunt. Her other hand held the phone. Her lips were parted. The wetness on her fingers was visible even in the low light. The image disappeared after a few seconds.

Mia’s hand moved faster on Adam’s cock. She stroked him hard, base to tip, while she typed the last message.

Adam: Next time I want the sound too. I want to hear how wet you get when you think about me fucking you.

She set the phone down on the bed. Adam’s cock was throbbing in her fist, the head dark and wet. Mia looked up at him, lips shiny, and kept stroking.