Chapter 1 Pt.3 (last)
Whimpering in disappointment at this turn of events Alex quickly did as she was told, turning onto her stomach and presenting Haley with that big fat ass of hers. The ass Haley had been mocking her about for a while now, despite the fact that Haley had been drooling over those big round cheeks almost as much as Alex's big boobs. To be presented with that fat ass now that she was consumed by forbidden lust, oh Haley was so impressed she managed to return her fingers to Alex's cunt before becoming lost in her twisted desire for her own sister's big booty.
Alex was confused why Haley had insisted on putting her in this position, but it seemed like a small price to pay for the return of those wonderful fingers. She soon got her answer as she felt a soft peck on her ass cheeks, followed by another and another and another, Alex first frowning at the touch, then giggling, then letting out a gasp of surprise as Haley buried her face between her butt cheeks and 'motorboated' them just like she had her tits. Which like before was weird, but then Haley pushed her face directly in between those cheeks and started frantically licking Alex's ass hole, leaving the younger sibling to blush, groan and then moan in pleasure.
It wasn't like Alex hadn't heard of this before, but it wasn't something she ever imagined experiencing herself. Now she felt her bitchy big sister's tongue against her forbidden hole Alex wondered why she had never imagined this. Ok, well not this exactly, but someone other than her sister licking her ass, because it was surprisingly good and it give her an intense feeling of naughtiness. Or more accurately intensified the feeling of naughtiness, as this was a taboo on top of a taboo, Alex feeling like such a dirty slut to be letting her own sister licking her butt hole.
The fact that she had such an antagonising relationship with Haley certainly helped. After all, if they were ever in an argument in the future, and obviously no one was around, Alex could not only tell Haley to kiss her ass, but remind her big sister that she had eagerly done just that and she was welcome to do it again. And she'd definitely do that when Haley teased her for having a 'fat' ass, although Alex doubted that would happen again given the way her big sister was frantically lapping away at her back hole, at one point Haley even pushing her tongue inside that forbidden hole and then switching from licking around the inside of Alex's rectum and literally ass fucking her with her tongue.
Despite the fact that Haley wasn't able to get very deep the sensation alone was a major turn on for Alex, and combined with the wonderful fingering the brainy brunette was pushed over the edge of several more wonderful climaxes. In fact by the time Haley finally removed her face from Alex's ass Alex actually kind of wanted a break. However Haley had other plans, and as exhausted as she was Alex just couldn't complain when her older sibling left her fingers inside her as she crawled up her body until Haley's boobs were pressed into her back and her extremely wet cunt was pressed into her butt, Haley panting into her ear as one sweat soaked sister rested against the other.
Haley knew she should be grossed out by the sweatiness, but she was just too horny to care. All she wanted to do in that moment was get off, and she knew exactly how she wanted to get off. It was sick, it was twisted, it was weird, but she just did it. She humped her little sister like some kind of wild animal, grinding her aching nipples into Alex's sweaty back and more importantly her near bursting cunt against that big juicy ass. It was the latter thing which had Haley cumming in what felt like record time, seemingly only a few seconds of rubbing herself against those meaty cheeks before she covered them in her cream.
Of course it wasn't just physical pleasure which pushed Haley over the edge, it was a mind blowing fact that she could taste a combination of her baby sister's pussy, ass and girl cum in her mouth, which served a wonderful reminder of the number of unspeakable acts she just joyfully performed on her own flesh and blood. Of course there was a physical element that, but what was purely psychological was what she was doing to Alex in her mind. Because in her twisted little head she was fucking her kid sister with a strap-on, either pounding her virgin cunt or her equally untouched ass hole, Haley taking Alex's virginity in every conceivable way and making her curvaceous sibling's body all hers.
The whole time she pumped her fingers in and out of Alex's pussy, and cupped one of those big boobs, so the two sisters were able to cum together. Which felt sweet and romantic, in a very sick and twisted way. Then Haley collapsed exhausted against Alex's back, finally removing her fingers from her pussy and her other hand away from her boobs, and just laid there for several long seconds. Then sometime later Haley rolled them so she was spooning Alex, the two sisters awkwardly working together to get underneath the bed sheets so if anyone saw them they would have no idea they were naked.
There was a long pause, then Alex finally took off the glasses she been fighting not to break and weakly placed them on the side table, and then giggled breathlessly, "Wow... I totally forgive you for everything you ever said to me."
"Shut up nerd." Halley groaned softly, and then after a few seconds mumbled, "I love you."
Alex smiled softly and mumbled back, "I love you too."
Haley gritted her teeth from saying something stupid as her beautiful baby sister drifted off in her arms, Haley staying awake for a while just to watch Alex sleep. She hadn't realised it until now, but Haley's unspeakable crush had turned into something so much worse. Something which went beyond natural family feelings or unnatural forbidden lust, and as she expected Alex only felt the former and perhaps the latter Haley was somehow more miserable now than before she got a taste of what she really wanted. Then again maybe she could fuck her sister into loving her? It was worth a shot.