While I've written for erotica before, mainly with my currently ongoing harem fic entitled "An Arsenal Of Pleasure", I haven't gotten around to writing a threesome yet though I intend to add one to that fic but not anytime soon. For now however, I've decided to write a hopefully hot threesome scene for Fitz, Simmons, and Caitlin as a smutty crossover between "Agents Of Shield" and "The Flash".

Disclaimer: I don't own "Agents Of Shield" or "The Flash".

Team Flash, consisting of Barry, his girlfriend and former police detective Patty Spivot, Cisco, Caitlin and Frost, the two having once shared Caitlin's body before they'd split in two and were now living their own independent lives, Allegra, and Chester, was currently working with the small team of S.H.I.E.L.D. agents led by their current director Alfonzo "Mac" McKenzie, or Mack for short, and consisting of former director Phil Coulson, Agent Melinda May, Agent Skye, Agents Fitz and Simmons who were the team's science duo and a deeply in love couple, Agent Elena "Yo-Yo" Rodríguez who was also Mack's girlfriend and love and a superhero in her own right, redeemed Agent Grant Ward who'd once been HYDRA, Agent Tripp, and Agents Lance Hunter and Bobbi Morse who were an on and off again couple.

The two teams had partnered together in an operation in France in which they were aiding former S.H.I.E.L.D. director Nick Fury, former deputy director Maria Hill, and their S.H.I.E.L.D. special forces unit to destroy the last and largest HYDRA cell, the one over all of the others worldwide which were now destroyed, led by their villainous and cruel head Baron Von Strucker and his partner who called herself Madame HYDRA and once the operation was successfully completed it would mean the complete end of HYDRA, as in no more heads growing in its place.

At the moment it was nighttime in France and everyone was inside of their respective rooms as they rested up so they could be prepared for the operation tomorrow though Caitlin and Frost opted to share a room. The couples were also assigned their own shared rooms.

As everyone was presumably sleeping, Caitlin awakened from her slumber feeling thirsty and so very quietly, as not to disturb Frost, she crawled out from underneath the covers of her bed and tiptoed her way to the kitchen where she poured herself a short glass of cold water. After gulping it down, she placed the glass to the side and was making her way back to her room when she overheard what sounded like moans, moans which sounded pretty sensual in nature.

Letting her curiosity get the better of her, Caitlin followed the sounds and found herself at the door of Fitz and Simmons bedroom, where the sounds were originating from. Pushing the door open a crack she peered inside and was met with a highly erotic site for there was Fitz, wearing nothing but very short boxers and standing before Jemma who was topless, her curvy nude breasts hanging free, and also wearing nothing except for a pair of lacy red underwear. Fitz's head was tucked into her cleavage and he had his lips wrapped around her breasts, alternating between each breast, and one of his hands was inside of her panties and buried inside of her warm pussy as he plunged his fingers back and forth, massaging her clit.

Jemma in turn had one of her hands clutching the back of her lover's head and pressing it into her cleavage and her other hand was inside of his boxers and wrapped around his throbbing cock as she stroked it, alternating between slow and fast. And her head was thrown back in ecstasy as the two lovers let out sensual moans and groans.

The entire scene was making Caitlin hot and bothered and not being able to help herself she moved her own hand underneath her dress and plunged her fingers inside of her now dripping wet pussy and stroked it as hard and fast as she could while also rubbing her own clit, lips parted slightly, as she imagined her fingers as a cock screwing her warm and soaking wet depths.

The three of them moaned together as they worked themselves up until their orgasms hit and the two females juices erupted from their pussies while Fitz's cock shot out bursts of cum which coated Jemma's hand that was stroking him. Afterwards the two of them engaged in a deep french kiss, their tongues tangling together, until their lips parted and hearing a noise turned their heads and saw Caitlin peaking at them through the door crack.

The young doctor had just come down from her high when she noticed the two pairs of eyes staring at her, realizing she was busted. But to her surprise she saw that the duo was grinning at her.

"So ya liked the show I take it?" Fitz smirked while she smiled back with a shrug, biting her lip.

"It looks as though she more than liked it if that wet spot between her legs is anything to go by," Jemma smiled widely while gesturing towards the aforementioned area while Caitlin's cheeks reddened as she blushed in response. Jemma then asked her an unexpected question.

"Would you like to join us?" she asked with a seductive looking expression as she and Fitz, the latter also keenly interested in this idea, both reached out their arms towards her and gestured their fingers in a come hither motion.

While surprised by this turn of events, she wasn't going to turn down their offer and returning their grin and with a seductive expression upon her own face, she sauntered towards them and allowed their arms to wrap themselves tightly around her body. She then tilted her head upwards towards Fitz who captured her lips with his in a steamy and moist lip lock, their open mouths pressed together and their tongues dueling each other while Caitlin sucked at his bottom lip, the two of them moaning together.

Their lips soon parted with a wet pop and she then turned her head towards Jemma and their lips smashed together as the latter thrusted her tongue deep inside the former's mouth aggressively and they began a heated and wet make out session, sucking each other's tongues, and not stopping until they had to part for air, disengaging from it with a smooch sound. They continued switching partners as they shared hot and deep kisses between the three of them while Fitz and Jemma managed to get in their own kisses with each other.

Afterwards and with the three of them feeling so horny right now that they weren't in the mood for foreplay and having pretty much already engaged in foreplay decided to skip to the main event. And so both Jemma and Fitz shed their underpants and Caitlin lifted her nightgown off of her body and tossed it to the side, leaving the three of them completely nude before each other while each of them took a moment to appreciate the shared view, Fitz laid back on the bed and Jemma situated herself above his hips while Caitlin squatted above his head.

A moment passed and then both Caitlin and Jemma dropped their hips downwards and his rock hard cock found itself inside of the latter's sopping wet pussy and buried to the hilt while his face was buried between the former's legs. Both women then began to rock their curvy hips forwards and backwards as they rode him hard and vigorously while he responded by holding Jemma's hips and continuously lifting his hips and ramming them into hers hard and fast, their hips meeting and smacking together hard and causing wet clapping sounds to be heard throughout the room as he went deep inside of her and his cock stroked her clit.

Simultaneously he plunged his tongue deep inside of Caitlin's pussy and ate her out, practically french kissing it as he sucked it with his lips while his tongue made deep strokes inside of it. He also sucked on her clit, causing her to let out very loud moans which increased until she had to quickly lift her hand and clasp it over her mouth lest the sounds she was making awakened everyone else.

The women continued to ride Fitz with all they had, now alternating between rocking their hips and rotating them while circling their shoulders sensually as the three of them were surrounded by a haze of passion.

Soon they found themselves on the verge of cumming and shortly afterwards they came together as Fitz shot forth thick loads of his seed inside of his girlfriend while hers and Caitlin's pussies exploded and drenched his cock and face respectively with their juices. The women then quickly switched places as Caitlin buried his still hard cock into her own pussy while Jemma was the next one to ride his face. His tongue buried itself deep inside of her just as it had with Caitlin and she enjoyed his ministrations as he pleasured her with his mouth while Caitlin rode his length and couldn't get enough of it as it plunged into her ever so deeply. In fact she found his cock to be the best she'd ever experienced.

Fitz on his part moved his hips into Caitlin's like a jackhammer, neither one of them holding back while he also ate out Jemma's pussy as though it were his last meal, sucking and licking her own clit.

The three of them enjoyed their intense coupling together and overcome by the pleasure currently coursing through their bodies, the two women leaned forwards and pressed their lips together in a passionate and lustful make out session once more, sucking and pulling each other's lips as their tongues met and danced erotically while they took turns pushing their tongues inside of each other's mouths.

In addition they reached out their hands and used them to cup and massage each other's breasts.

Soon they all found themselves about to cum once more and with a shared shout, they exploded simultaneously with a torrent of both cum from Fitz and juices from Jemma and Caitlin as he filled up the latter this time around while his face and cock found themselves drenched once more, the three of them in a euphoric high during their shared orgasms. Once they finished the women fell onto their sides and curled into Fitz, wrapping themselves around his body.

"Wow that was amazing! I've never had a threesome before and thanks so much for letting me have such hot fun with you guys. It definitely rocked my world," Caitlin exclaimed and then happily thanked them.

"Thank you so much as well. We'd always wanted to have a threesome to spice things up in our bedroom but could never find the right person until now. And you definitely rocked our world as well," Jemma replied with a huge smile.

"What my girlfriend and hopefully future wife just said," Fitz added with a smug smile, causing both women to giggle as the three of them agreed that it was definitely worth it and even agreeing to get together again once in a while for some more fun if they were ever in the mood.

The End

A/N What did you guys think and especially with my first time writing a threesome? Please let me know of you want and please feel free to send me feedback and I hope this was enjoyable.

Have a great day.