My wife offered me her best friend for a free-use birthday [MF]

This occurred a few years ago. My wife Grace and I had been in the "lifestyle" for a couple years at this point, after first getting into it with our close friends Nat and Jon. We had swapped with them relatively often and were fully comfortable with them at this point.

It was a couple days before my birthday and I woke up on a Saturday morning around 9:30 am. No work, no responsibilities, just a lazy day ahead of me. My wife wasn't in bed next to me, which isn't unusual. I reached over for my phone and saw a message from her.

"Gonna be out running errands all day. I left something for you in the guest bedroom."

Ok cool. I love my wife and love spending time with her on lazy days like today, but I understand that she's got stuff to do. No big deal.

I spent the next 15-20 minutes just scrolling on my phone as I shook out the cobwebs while waking up. Eventually I decided to get up and see what she was talking about.

I pushed open the door to the guest bedroom and saw Nat, my wife's best friend, laying on the bed, also scrolling her phone, but without a single piece of clothing on. My jaw dropped.

"There you are!" she said excitedly. "I know you're not an early bird but 10am is kind of pushing it, don't you think?"

I don't even remember what I said to her. Yeah, I'd seen her naked before. I'd fucked her. Numerous times by this point. But to wake up to her sexy body greeting me in an empty house was new.

"So here's the plan," she said matter-of-factly. "Grace is gonna be out all day. It's just you and me. She figured you'd have a lot of fun with me today."

"Wow," was all I could muster. I was trying to maintain eye contact but my eyes couldn't help but travel up and down her body as she spoke.

"I think she just expects that we'll have a lot of sex. Which we will. But I'm adding my own caveat to it."

"Uhm, ok. Whatever you say," I responded.

She smiled. "I'm going to drain you. By the end of the day you won't have a drop of cum left in you. I'm going to use that beautiful dick of yours over and over and it'll be on my terms. You'll do what I say without question when I say it." She stood up as she finished. "Got it?"

My wife is the sexiest woman on the planet. The sex we have is incredible. But she's not particularly assertive. I'm usually the one "in charge" during sex, which is something I don't mind at all. But to have the script flipped and be at the mercy of a woman was something new that I was very much interested in exploring.

"Totally. Do your worst," I said with a smirk.

"You've got the right idea," she replied. "Now take everything off. You're not wearing anything at all until Grace comes back in the evening."

She could have told me to lift a pickup truck and I would have done it at this point. I dropped by pajama pants and boxers and pulled my shirt off over my head. My dick pointed out straight towards her. Her eyes were locked on it.

"Mmmmmm, I missed him," she said as she reached out and grabbed it. She tugged at me a bit, making me come closer to her before she pushed me onto the bed.

Nat hopped onto the bed next to me. Instinctively I reached for her ass, hoping to slither a hand between her legs and feel her soft pussy. She slapped it away.

"No. I'm going to suck you until you cum down my throat. That's all thats happening now," she said with authority.

I was liking this surprise. She bent over and engulfed my dick in her mouth immediately. Nat doesn't gag and can deepthroat me in a way very few women can. She flicked her tongue along the underside of my cock as she stroked it in and out of her mouth.

"Ohhhhhhhhh, fuck!" I moaned as she sucked me. She smiled and looked up towards me as she continued stroking and licking my dick. With one hand she cupped my balls gently as the other stroked me into her mouth.

"Fuck, Nat! That feels so good."

I've been with her enough times to know that she really liked verbal feedback during sex. She began to lick around my head, flicking her tongue across my tip, tasting my precum.

"I really want to be inside you," I moaned as I began to realize that I won't last very long if she keeps doing this.

She pulled her mouth off me. "No. I already told you. You don't get a choice. You'll do what I want."

Fuck. As much as I wanted to feel her pussy wrap around my dick, submitting to her demands was even sexier.

"Nat...I won't last long," I said between gritted teeth as she continued working my dick.

"Good. Cum for me."

Willpower was non existent at this point. She wrapped her lips around my head and I shot rope after rope of cum into her mouth. My body shook as she brought me to my first orgasm of the day. After I came back down to earth, she sat up and looked at me with a mouth full of cum. She made a show out of swallowing every drop.

"Tasty as always," she said with a smile. "Now let's shower."

We got up and walked across the hall and back into Grace and my's bedroom. We hopped into the shower and she began to lather me up, paying special attention to my dick. She finally let me touch her and I wasted no time letting my hands explore her big, beautiful tits and tease a bit between her legs. My cock was responding again. I was getting semi hard as we touched each other under the hot water.

Nat got on her knees, looked up at me with her big, almond eyes, and took me into her mouth again. She teased my cock for a few seconds before standing up again. "That's all you're getting for now," she teased as she grabbed a towel and got out of the shower.

I finished cleaning up and went out into the bedroom. I grabbed a pair of underwear before I saw her peek into the room from the hallway.

"I told you no clothes, didn't I?" she said.

"Wait, you were serious? Like nothing at all?" I asked.

"Nothing. You can wear a robe just to stay warm if you want, but it has to be open in the front. I need access whenever I want."

My mind was spinning. Best Saturday morning ever.

I grabbed a robe and went downstairs to meet her in the kitchen. She was wearing small, soft cotton shorts and absolutely nothing else. Her tits were on display and I couldn't help but watch them sway and bounce as she made herself a cup of coffee. I got myself some coffee and a granola bar (I'm not much of a breakfast person) and sat down on the couch to catch my breath and have breakfast.

Nat joined me and sat on the other couch across from me. Despite my dick being out and on display (and still semi-hard) and her being almost naked, we had a fairly normal breakfast. We chatted about work, spouses, life, etc. The usual. Only our spouses weren't here. And we were naked.

After 45 minutes or so, it was now near noon and I was curious what else was the plan for the day. I texted Grace. "I found what you left for me in the guest bedroom. Thank. You."

Grace's reply came almost immediately. "I knew you'd like it. I'm still out and will be busy most of the day. I might swing by Jon and Nat's house. Jon is probably fairly lonely right now. 😉"

I told Nat and she giggled at the thought of Grace stopping by to have a quickie with her husband.

"So what else do you want to do today? Want to go somewhere?" I asked.

"Nope. I'm going to use you to your full potential today. I want your cock sore and spent when Grace comes home."

"That's more than fine by me," I replied.

Nat's demeanor shifted a bit. "Doesn't matter if it's fine by you. It's what's going to happen. Now lay down."

I loved this side of her. I immediately followed her commands and laid down on the couch. She walked over to me and without a word swung her leg over to straddle my face. She pulled her cotton shorts to the side.

"Lick me. Now. Make me cum."

Without hesitation I grabbed her by the hips and planted my lips on her pussy. She was wet. Her juices tasted so sweet that I could have sat there for hours licking her. She moaned as I began to spread her labia and flick my tongue across her hole. I always love to tease.

"Stop that now," she commanded. "My clit. Make me cum."

I don't need to be told twice. I licked up a bit and found her swollen clit immediately. She moaned loudly as I made contact with it. "Good. Right there," she moaned out.

I licked circles around it, intermittently flicking it to gauge her reaction. When I could tell she needed it, I focused exclusively on rubbing the tip of my tongue across her clit as she built up to orgasm. My cock was hard as a rock of course and she reached behind her to grab it. She wasn't stroking it, just holding it tightly.

"Yes....yes...yes...don't stop...make me cum...now...yes...yes." Her words devolved into meaningless moans as she got close. Eventually she tightened her thighs against my head and I felt her whole body shake.

"Fuuuuuuuuuuuuuck!" she yelled. "Yes!" Her orgasm took her over and her grip on my dick tightened. When she finally subsided and opened her eyes again, she looked down at me with a needy look on her face.

She got off my face and immediately impaled herself on my dick. She was dripping wet and it wasn't hard at all to slide all the way into her. She began to gyrate her hips on me. The way her tight pussy grasped my dick was always incredible, but even more so when she was so intent on being in charge.

She held my face in her hands. "Don't last. You have to cum for me. I want your cum inside me and you're going to give it to me, understand?"

All I could do was nod as she continued to ride me.

"Good." She threw her head backwards as she focused on making me cum. Again, it wouldn't take long. This entire morning was wild and erotic in a way I'd never experienced before.

"Cum for me now," she demanded. "I want it in me and you're going to give it to me. Don't resist," she said in her commanding tone.

Eager to please her, I grabbed her hips and pushed all the way into her, shooting my second load of the day into her wet and waiting pussy.

I opened my eyes and saw her looking down at me. "I like that you listen to me," she purred. "I'm far from done with your dick. So it's nice to know you'll follow whatever I command for the rest of the day."

All I could do was smile and feel the last couple twitches of my dick inside her.