The next few days passed by quickly for Steve. The unbearable tension that had been building between himself and his stepmother had finally snapped, and now that the secret was out that they were attracted to each other, Steve didn't have to agonize through hiding his erections when he was around her. For her part, Melissa really seemed to get a kick out of Steve's near-constant arousal, and she didn't waste any opportunity to call attention to his horniness, and to tease him about it.
"I mean, I know you just graduated college," she said one morning, smirking down at the blatant erection that was tenting his oversized pajamas, "And that young people have a more voracious sexual appetite...butttt, like...geez louise, Steve, it's like you can't even help yourself whenever I'm close by. Your penis just goes *boing!* when I walk into the room. Hahaha, I'm not exaggerating, am I?"
"No...I...no, you're not," Steve admitted, blushing. Even though the sexual tension had indeed been broken between them, he was still very much getting used to Melissa's flagrant and unabashed sexual teasing.
"Mmmmm, such a little horndog," she chuckled, ruffling his hair with her big hand. Having been previously ignorant of sexual lingo, she had started looking up phrases to use to tease her stepson, and "horndog" was one of her favorites.
"You know it's pretty weird for me to hear you use words like...like "horndog," right?" Steve said, trying to affect some semblance of protest against her flirty, dominating presence. Of course, this was all just part of the game -- the truth was that he loved her teasing, and the way that she had started to lord her body over him. Even feeling her big hand palming the top of his head was enough to pump his cock fuller, tenting his pajamas even more.
"Well, what else am I supposed to call you?" Melissa laughed. She backed away from him and put her hands on her hips. "You're the one who's been walking around with that erection poking out of your pants for the past three days!"
"And whose fault is that?" Steve countered immediately, sticking out his chin as he hopped out of his chair defiantly. As he did so, though, the reality of their size difference became even more palpable, and he wasn't able to help matching Melissa's wry and knowing grin with one of his own. He could only pretend to be indignant up until a point. The truth -- that he was helplessly attracted to Melissa's curvy, growing body -- was undeniable at this point.
"Hey, I'm only responding as a woman to the social stimuli I receive!" declared Melissa loftily, straightening her figure more as she rose up above him even higher.
"Oh here we go with all the science jargon," Steve groaned, rolling his eyes.
"And you can't deny," Melissa continued, talking over him, "That it is only natural for a woman of my age and reproductive disposition to ornament and accentuate herself in response to overt male sexual attention, regardless of whether or not he is from her primary group. The more success she has, the more she is driven to impress."
"Translation: ever since we first had sex you've been flirting with me, trying to seduce me over and over again, even though I'm your step-son, and now you're totally shameless, as that see-through dress you're wearing shows," Steve responded, putting his own hands on his hips. He was quite pleased with how he was faring in his verbal joust with Melissa, but it was hard for her to take him seriously, with his cock pointed up at her like that. She put her hand to her mouth in an attempt to unsuccessfully stifle a laugh.
"Pssshshshahahha ohhhkay, Steve," she chuckled, "You're right." She bent herself down slowly, luxuriously, at the hip, so that she was now staring down directly into his face. Steve felt the hot color rising in his cheeks; just the way she moved, and the way she looked at him now...it was so hot. And she was just so...huge compared to him. Even bending down like this, she was still a good six inches taller than him.
"But it's working, isn't it?" she breathed sexily into his face, glancing down in obvious amusement at his erection before bringing her eyes back up to meet his again. "You can be clever all you want, Steve, but you can't deny that you've got the hots for your stepmother...and that I've got your cute little body wrapped around my finger...or my big, fat ass, as it happens."
She then made a point of turning around very slowly, curving her back elegantly as she stuck out her large ass, popping her thick hips suggestively as she did so. She proceeded to jiggle and bounce her heavy ass cheeks suggestively, making them gyrate up and down, up and down, in a teasing and intimidating cadence of erotic display. Steve blinked and swallowed. He had no response to this, of course. Standing in front of her as he was, Steve saw that Melissa's ass spanned all the way up from the middle of his chest to his neck.
He had already lost count of the number of times they had had sex in the past three days, and their sex usually ended with Melissa backing him up into a wall, suspending his entire body, or smushing him hard into the sofa cushions, or imprinting his torso onto her mattress or...whatever it was -- their sex always ended with his body wrapped around her huge ass, with him holding on for dear life, as she rode him hard down the searing highway of multiple orgasms. And her ass, and her height, and her curves, had only increased since they had first fucked, while Steve's body had gone in the opposite direction.
Melissa slowly turned back around, arching a playful eyebrow down at him, as she allowed him to once again drink in the reality of the size difference between them. Steve's shrinking had slowed somewhat over the past couple days, but it was still ongoing -- he had shrunk down to 4'5 now, while Melissa had grown to a towering 6'5 in her bare feet, a full two feet taller than him. She was standing in her bare feet right now, but when she was wearing her sexy black platform heels, she rose up to an incredible 6'11. When she was that tall (as he had experienced the night before), Steve found that he was looking slightly up at her belly button, with the top of her ass actually being even with his eyes.
"Hmm, nothing to say, huh?" Melissa teased. She winked down at him, sticking her tongue into the inside of her cheek. "It's ok Steve -- I understand."
In these situations, part of Steve couldn't help but notice how obvious it was that Melissa was "playing sexy" for him. The way she opened her mouth like that, sticking her tongue into her cheek, posing with her hips, winking...it was all a little concocted, a little too obviously performative. But ironically, he was beginning to realize that Melissa's awkwardness was exactly what made her so sexy...well, that and her knock-out body, of course. Even though she was obviously still a nerdy scientist who didn't have much sexual experience, the mere fact that she was making the effort to "be sexy" for him made Steve hopelessly hard. It meant that she wanted him...that she enjoyed seeing him get hard...that she loved watching her effect on him. Subconsciously, her behavior was tickling and stroking Steve's submissive urges more and more every day, and the novelty of her clumsily tenderfooted approach made it all the more arousing for him.
"You know, Steve," she remarked suddenly, stepping forward and rapidly closing the gap in between them, "I had been meaning to tell you yesterday -- we're actually pretty close to discovering the shrinking component in that multivitamin I gave you for the trial."
"What!?" Steve burst out, his head jerking up to look at her. He couldn't quite see straight up into her face, since he had to look halfway up her stomach and in between the twin behemoths of her breasts, which jutted out high over his head. Even still, he could see Melissa's entertained expression, chucking down on him. Steve tried to back away from her to get a better view, and to establish a more "normal" setting for this conversation, which had suddenly become quite serious for him. But Melissa didn't let him; instead, she reached both her arms down, effortlessly seizing both his hands in hers, completely engulfing them as she proceeded to wrap his little arms around her ass cheeks as far as they would go. Steve felt like he was hugging a plush, firm, sweet-smelling tree -- his arms were only able to go two-thirds of the way around her big ass before they were stretched to their limit. In this way, Melissa was "trapping him" around her ass all over again.