Fantasy... MMF

For a long time we've fantasised about having another woman or man join us in the bedroom. We've never taken the next step and to be honest, not likely to when there are others in the household. However, not to say that one day we couldn't temp fate a little.

My latest fantasy is for Mrs to wear her lovely short skirt, nice heels and gorgeous sandal toe, seamless tights with no pants, on a wee drive into the country. We pull into a nice wee spot, lovely views over the city, quiet, not a soul about. Her legs are amazing, i love the feel of nylons on her pins and quickly I'm rubbing her pussy and it is soaking. (i want to slide my fist into her one day soon, but that is another story!).
She takes my cock in her mouth and goes to work, giving full attention to my swollen head and hard shaft with her tongue, spitting on it, sucking and slurping.
We're so busy that at first i didn't notice the guy watching us from the other side of the parking spot, looks like he is enjoying the show, as he has one hand down his trousers yanking on his boner. I motion at him to come over to where we are parked and he duly obliges.
By now she is soaking and i have four fingers pumping her pussy, she has a mouthful of my cock down her throat and this guy is 3 feet from the car door, I tell her I'm about to explode and for the first time she keeps sucking and slurping, allowing me to cum in her mouth at last. I've wanted to do that for so long, she keeps going, allowing my spunk to dribble out of her mouth and over my cock.
By this point i've already told her how hot it would be to watch her sucking another cock, or wanking one off - as per our normal fantasy bedroom chat - hence her soaking pussy. As she comes up from my sticky cock, i tell her to look out her door and initially she is shocked and not to happy. I explain, look, no harm done, guy is just watching us and we have fantasised about it long enough.
She calms down, so I say, how about it, want to let him cum over your lovely nylon legs, maybe even suck his hard cock?
to say she was shocked was the least, but at the same time, she is curious, are you sure - she asks? hell yes, we're here now, lets go for it before we think too much about it.
She opens the door and he steps closer, she grabs his bulging cock and starts to wank him, do you want to suck him i ask?
you want me too?
go for it, i'm with you, your not cheating on me and with that she takes the strangers cock into her mouth.
her legs open as i start to finger her pussy again, she is so wet, i rip the crotch this time and start to slide 3, then 4 fingers in, fuck it, i'm going to slide my hand in, she is so wet and open right now, for the first time i slide my fist into her as she sucks this guys cock.
He's ready to cum and I want to see him wank over her legs, she takes his cock out and she starts to pull his cock harder and harder as i fist her pussy.
In no time, he empties over her, some going on my arm, he gushes a ton of spunk onto her lovely legs as she screams to yet another orgasm.
When he finishes, he pops his cock away, thanks us and heads off again.
we look at each other, neither believing what we have just done but we take each other and kiss and hold each other like we always do.
life has changed, we enjoyed our first encounter, should there be more ?