Spiderman knew the Fantastic Four well. He'd even been a member of the team when they were calling themselves the Future Foundation. They were amongst the few that knew his secret identity as Peter Parker. They were not aware of Peter Parker's secret identity Otto Octavius.
Johnny Storm was one of Parker's best friends, but the Superior Spider-Man was more interested in his sister. Susan Storm was the smart and sexy super-heroine: The Invisible Woman. The simple fact of it was: she was hot.
"We should make out," Spidey said. "What?" Sue spun around to face him shocked. "That's what we do, to enough the Torch, isn't it?" his mask was off, and the Peter Parker face was grinning. "Peter..." she said, still surprised at the suddenness of this request, "that was years ago, and I'm married now." Peter sighed, but didn't reply.
"Alright, we don't have to do it in front of Johnny, it can be our little secret," he decided. She raised an eyebrow. "Don't try and tell me you don't want to," he teased, "I mean Reed's a great man, fantastic actually, but when was the last time you made love and he was paying attention rather than working out equations for his latest project in his head?" Susan bit her bottom lip silently, unwilling to admit the truth of Peter's words. "Wouldn't you like, just once, to make love with a man who is not only scientifically brilliant, but also keeps his mind in the 'real' world most of the time? A man who would actually have sex with you, not just go through the motions..." Sue swallowed then she sprung forwards, flinging her arms around him and pressing a kiss to his mouth that quickly turned into a full-on snog.
He wrapped his arms around her and pulled her back with him onto the desk of the particular workshop they were in, inside the Baxter Building. She was already ripping at his costume, desperately clawing at it to get it off. Peter was impressed by her enthusiasm. He ran his hands down her back slowly. When they reached her ass, he squeezed it tightly, evoking a moan from the blonde's succulent lips.
Being heroic clearly suited Susan, looking at the shape of her body. It was the kind of body you couldn't help but dream of screwing. He then traced a finger along the inside of her thigh, slowly dragging the digit over the blue molecules of her costume. When it reached it, that finger continued to trace lines, specifically spirals, into the section of her costume over her crotch.
Sue's breathing sharpened as he stroked her vagina. Most of his costume was already gone but her costume was relatively untouched. Susan realised that Peter probably had no idea how to get it off of her. There was a zip on her back that undid it, but it was well concealed. She gestured to it for his benefit; he nodded his thanks.
They shuffled around on the desk so that he was on top, then he spun her around to face the desk, giving him easy access to her back. He caught the zipper between thumb and finger on one hand, the other hand still at her crotch, and slowly dragged down. With each part of her skin that was revealed, he felt his erection grow, and Sue felt the bulge in his boxers press against her a little harder.
He was stripping her tantalisingly slowly, and at that exact moment he was taking a break from the zip to massage her shoulder blades, but his hand that was trapped underneath her was anything but slow as it rubbed her vagina. Sue had devolved into a string of gasps and moans as he massaged both her shoulders, and her pussy.
The zip made its way down gradually, and was eventually in such a position that Peter could tear her costume away from her body. She was still moaning, still face-down on the desk, still having her pussy pleasured, still pinned down beneath him, and still clad in her underwear. Peter decided only one of those things was a problem and his free hand rapidly unlatched her bra.
His vagina-rubbing hand slipped inside her knickers and worked flesh on flesh. By the time his fingers dipped inside of her, pumping in and out of her entrance, Susan was wailing with arousal. With his other hand, he yanked her underwear down to her ankles, then did a similar move to his own. He pulled himself close to her and the free hand slid around her waist to her breasts. Storm's modest rack was enough to keep that hand busy, pinching her left nipple then working the boob up and down roughly.
With both of this hands occupied, there was only one more part of him that Peter needed to satisfy. His cock pressed at her ass but didn't move any further, as if waiting for some kind of signal. Amidst the gasps of pleasure Sue was overtaken by, she managed to cry out something along the lines of 'fuck me!' This was apparently the signal Peter was waiting for as he immediately grinded his body down into hers, his dick sliding into her ass.
It didn't take long for him to get into rhythm, pounding up and down into her. If he had a dollar for every time she moaned out, he'd be richer than Tony Stark. His right hand kept groping her breasts, squeezing and tugging eagerly. His left hand fingered her deeply with two fingers while his thumb encircled her clit.
Her body trembled with each thrust he made. He was stronger than anyone else Sue had ever been with, clearly spider-strength was underrated. Susan wasn't sure how long she could last with him slamming into her ass. When he dragged his tongue up along her spine just as the deepest finger-pump coincided with a massive thrust of his hips and a hard grab of her tits, she couldn't last any longer.
Peter felt the wet sensations in her pussy grow, soaking his fingers, but he kept pounding, fucking her as hard as she deserved. His fingers left her vagina and travelled up to her boobs. He cupped a breast in each hand, and then he squeezed to an even tighter grip than earlier provoking her to cry out. All the while he kept screwing her ass.
Sue Storm calling out his name in lust and desperation during her second orgasm along with the loudest wail yet, was what set Peter off. His screwing grinded to a halt as he came. Both of them lay panting as the cumming start to tail off. Peter was quite enjoying, lying there, pressed against her back, pinning her to the desk, when suddenly she disappeared. Sue had turned invisible. He felt her slither out from underneath him and he rolled over onto his back in slight disappointment. "Where are you?" he muttered, his eyes searching the room.
He felt an invisible set of fingers wrap around the shaft of his cock and it immediately stood up erect again. This was followed by an invisible pair of lips, aided by an invisible tongue, close around his penis. Then it was Peter's turn to be lost in a string of gasps and moans...