Tease her

"Oh, I will. Tomorrow night I'll be late home from work again."
"Sure."
I lead her into the bedroom as I continued.
"Yea, so while you're at home making dinner for us I'm going to be screwing Gina on my desk."
"Right."
"Yep, I'm going to see her during the day and let her know I'll need her help after work with a problem I have. I'll have been imagining fucking her first so I'll press my hard-on gently against her arm as I stand by her chair. She'll know exactly what I mean, and she'll want it too. I'll tell her to come into my office once everyone's gone so when can get to work."
"Sure you will."
"Oh yes, while you're at home cooking you'll be wondering exactly what I'm doing. I might even call you and leave the phone off the hook so you can hear. She'll come into my office, her blouse undone a few buttons, her breasts barely held in and her bra showing."
"Mmmhmm."
"I'll ask her to come around my desk so she can see what I'm working on."
"Oh, what'll that be?"
"She'll come around and I'll sit her in my chair. Then I'll flip to the video of her on my screen, looping at the point where she is watching me and showing me her tits."
"Oooh, that's bold."
"Yea, then while she watches it I'll massage her shoulders, and slide my hands down her top, cupping and squeezing her breasts. She'll start moaning as she watches herself on screen and feels my hands roaming her chest. Then I'll spin the chair around and tell her to take me out. She'll reach forward and undo my pants and let them fall to the floor. She'll pull my boxer briefs down freeing my cock. It'll be hard and ready for her. She'll smile at me then look in my eyes as she takes me into her mouth."
"Ooh, is she good at sucking cock baby?"
"Yea honey, she's real good at it. She'll stroke me like you do, but she'll be running her tongue around me the whole time, and fondling my balls too."
My wife smiled, "and she'll stick a finger in your bottom while she does too!"
"Oh... yea, ok. She sticks her finger in me as she sucks me, and it feels great."
My wife pouted, clearly wanting me to be at least surprised or unnerved by the thought, but I'd turned it around on her.
"Then I'll pull her up out of my chair and sit her on my desk. I'll pull down her pants and expose her panty clad pussy to my sight."
"Oooh, what're they like?"
"Red. Deep Red, and lacy. I can see her pussy through them. It's swollen and wet, soaking her panties. She wants me in her."
"Nice, does she smell good too?"
I'd expected my wife to be **** with this scenario, but she was totally enjoying herself.
We were on the bed, my wife lying on her back with me above her as I told my story, and I moved down between her legs.
She was as wet as Gina was in this fantasy, and I pulled her panties aside. They weren't as sexy as I imagined Gina 's red ones, but her pussy was swollen and wet. I inhaled my wife's scent as I replied, "yea, she smells incredible. Her pussy is so cute and sexy and the scent intoxicating." I licked my wife's labia, "Mmm, she tastes really good too." I lifted up to kiss my wife and slipped my tongue into her mouth, "see? doesn't she taste good?"
"Mmmm, yea she sure does."
I moved back down and began sliding my tongue in and out of my wife's pussy, then licking up and down, circling around her clit each time. "She's got such a tasty little kitty baby, so soft and hot too. But now, I I'm going to fuck it." I pulled my wife toward the edge of the bed, "I'll pull her to the edge of the desk and lean her back exposing her before me, then rub my cock against her slit." As I told my wife what I would be doing with Gina, I did the same to her, rubbing my dick on her swollen pussy. "Then I'm going to enter her," and I pushed into my wife. "She's so tight, her little cunt not used to my dick, it feels so great."
"Ohhh, fuck, that's so fucking hot," my wife moaned, "fuck her hard baby, fuck her."
I held my wife's legs in the air with one arm and began thrusting deeply in her. She was loose, extremely turned on, and easily accommodating me. usually it took a while to get her to open up, but she was there already.
"Fuck, her pussy is so good," I moaned as I powered into the centre of my wife's need.
"I'm going to pummel her clit as I fuck her," and again I did the same to my wife, my free hand frantically stroking her engorged clit.
"Ohh... fuck baby, fuuuuck, fuck. Keep going, fuuccckk!"
She was close to orgasm, as was I. "I'm going to cum in the little slut's pussy baby," I yelled. "Oh fuck yes, I'm cumming in her fucking pussy, she's milking my cock"
I erupted at the same time, filling my wife with my seed, as she screamed "fuck yes, cum in her baby, cum... fuck!" and came herself, bucking forcefully into my hips, her fingers digging into her breasts.
She slumped then, spent, breathing heavily for a minute or two, as I lay down beside her.
Finally she managed to speak, "Wow, that was intense. The thought of you doing that to her was so hot. So nasty. I loved it."
I managed a laugh, and responded "yea, it was hot wasn't it?"
We snuggled and kissed gently, not saying anything further, just enjoying the moment, and soon fell asleep.