Paige needs some time and Amanda needs some help

Amanda's shirt is still up, showing off her C-cup tits to the three of you—but mostly to you, personally.

"Not cool, Amanda," Erika says coolly to Amanda. "John's taken. You have to ask permission to do something like that."

"I don't need her permission," Amanda protests defiantly. "Or anyone's, for that matter."

Paige looks like she's trying her best to form a response that won't escalate things further. "Why did you just flash my boyfriend, Amanda?" she says levelly.

"Because he wanted to see my tits," says Amanda.

Paige turns quiet. You feel as though you're expected to say something, but you've got no idea what to say in this situation. This entire outing is acting as a powerful realization as to how difficult it is to blindly navigate a completely different set of social standards. Erika coughs awkwardly

Paige gets up. "I need to go for a walk...clear my mind and stuff," she proclaims weakly, looking hurt and somewhat angry. "I'm sorry I insulted you, Amanda," she continues, not entirely convincingly. "Erika, it was fun making your brother come on your tits. John..." her voice falters as she looks to you, her eyes going a bit downcast. "I'll call you tomorrow, okay?"

Although you're not entirely sure if any of this is actually your fault, you feel terrible. You just want Paige to feel better. "Paige, wait," you call out. "Where are you going?"

"Somewhere," she answers. "I think I'll hang out at the library. I just want some peace and quiet. I'll probably be there a while, so you can come for me in about two or three hours...if you want," she says before turning away.

You look at her go, not really sure whether to follow. In the end, you decide to respect her and give her some time for herself.

"Ouch," says Erika. "Bad first date, John."

You turn to look at your sister putting her shirt back over her glistening chest, the cum soaking into the fabric. She has not cleaned your cum from her face. Amanda is standing with her legs together, her shirt back down, looking sheepish. You look at her for a moment, unsure what to think.

"Sorry, John," Amanda apologizes quietly as you continue to stare at her uncertainly. She actually sounds miserable.

You're tired of floundering, and at this point, you don't care if you look like an idiot—a promising friendship and relationship might have just suffered permanent damage. "Alright, enough's enough," you speak up. "Obviously, I'm being very thick and am missing something here. What's the deal?"

Erika sighs and sits back down on the picnic bench, ready to explain it to you as if you were a naive child "John, Amanda's always been jealous of the way that you used my body growing up. She and I were always the smallest girls in our classes, so we hung out at lunch time and stuff."

"Erika told me what it was like to swing into D-cup territory," Amanda chimed in, her voice still sounding small. "I kind of lived vicariously though her. Do you remember my eighteenth birthday party?" You don't—at least not this world's version of it—but luckily, the question was rhetorical. "I made it a fancy dress party for a reason. It was the only way I could dress like a porn star on my birthday and get away with it."

Amanda's face suddenly lit up. "It worked, though. Wow, did it really work...I got all sorts of guys feeling me up, and I could make excuses to the girls to get away with it for one day. And then Erika gave me her birthday present!" Amanda smiled brightly with the happy memory.

"Um," you ask dumbly, "what was it?"

Erika nods at you. "You were."

"What?" you ask blankly.

Erika lightly punches you on the shoulder. "I meant that literally! YOU were the present, dummy! Remember how I dragged you to that girls-only pool party that afternoon? Did you think it was an accident that the women's changing room was locked and that the men's was full of eighteen year-old girls getting changed? I set all of that up so you could get drained dry and so that you'd last longer with Amanda. At her party, all my busty friends rammed home the message that she hadn't lost her virginity until you came in her. Um," Erika paused, looking abashed. "Sorry, bro. I never knew that you could drain a guy so dry that he can't come for four hours. That was my fault."

Amanda's face was shining. "I'm glad she did. John, you made my dreams come true. I don't even care that you vomited all over me. It was almost like being a cumrag."

Well then. That certainly took an...interesting turn.

Luckily for you, Erika was now in full admission-mode. "Yeah, I'm not surprised that you don't remember it that well, honestly. My friends kept slipping you booze to keep you from asking why Amanda was still after you. They did the job a little too well."

"Is that why I was sore all over the next day?" you bluff, feeling prolonged silence in this discussion might not be the best option. "I felt like I was going to die."

"Yeah, sorry, John. We should have come clean," your sister admits, looking a bit sheepish. "You're a nice guy; maybe you would have played along for a chance to repeatedly fuck Amanda at her birthday party. But it was the D-plus gang planning it, and we're used to thinking that guys only pay attention to us."

"Well," you begin as you turn to Amanda, now understanding the scope of things. "I'm, uh...I'm glad that I could make your birthday perfect. Well, almost perfect, anyway." Truth be told, you wish you could have experienced parts of it, but at least not remembering it made it easy to be magnanimous. "And I think I can sympathize with what you want in life, Amanda. Believe me, I'd love to fuck you...again," you add after a second, realizing the slip-up with a laugh.

"Yeah, I bet, you horndog," Erika teases with a snicker.

"But...I don't think that you're going about it the right way," you say to Amanda, ignoring your sister's remark. "Is being this antagonizing about it really necessary?"

Amanda straightens up. "Erika and I have...an arrangement."

Erika nods. "Yeah. Look, there's a bunch of women like Amanda who are tired of getting ignored, and either want to be used or don't mind being a random side whore. We call them come-alongs," she explains. "Basically, they hang out with cumdumpsters and look for guys who don't notice or don't care about her below D-sized breasts. That kind of thing can be seriously dodgy to do alone, though. She goes with me so that she seems available by association, and so that I can watch her back. It helps when a come-along hangs out with a small D-cup, or much bigger than D. That's me," she says with a smile.

"I don't get much," Amanda admits. "But I love it when a man isn't paying attention and takes me from behind. It's so freeing," she says.

"And you're okay with Amanda basically whoring herself out for nothing?" you ask your sister. Even though your desires shaped this reality, you're still not used to anyone at all whoring themselves out for nothing—especially your own sister.

Erika looks back levelly. "Well, if I whore myself out for nothing, why can't she? Breast size shouldn't really be connected to this kind of thing, I think. If a woman wants to be a public fucktoy, why can't she? Amanda is a single child with a busty mother and busty friends. I don't want her to be alone and denied everything she's seen about being a woman. She's my best friend, and I support her fully in this. And she's never been anything less than wonderful about her situation."

Erika looks to Amanda. "Um, until now, that is...Amanda, it's not cool for you to come on to guys that strongly in front of their partners, especially if you don't know them that well. You only just met Paige, after all. That sort of thing can do a lot of damage, even unintentionally. You have to wait for them to come to you. You knew that Paige wasn't just another regular cumdump that John picked up and brought around—they were on their first date. What were you trying to do, ruin their brand new relationship?"

As Erika scolded her, tears began streaming down Amanda's face. Her mouth was twisted into a miserable scowl.

Erika blinks, looking as if an epiphany just struck her. She quickly slaps her own forehead and rushes over to hug Amanda. "I'm an idiot, I'm an idiot...I'm sorry, Amanda, I should have known."

For the first time, you're one step ahead of your sister—you figured out what this was all really about a few moments prior. The way that Amanda had smiled at you when they arrived to see you and a big-chested girl together, the expression on her face as she flashed you, the way her face beamed when describing her eighteenth birthday...everything was coming together.

Because of the stories your sister told Amanda, you have been the man of Amanda's most intense erotic fantasies. You always have been, ever since the time that Erika started fluctuating between C and D-cups. And ever since you popped Amanda's cherry in public in front of all of her friends, the deal was sealed.

Her face buried in Erika's chest as she continued to bawl, you could hear her muffled voice cry out. "It's not fair!" she shouts. "I was ready to make myself his plaything, but some big titted redhead virgin whore had to get him first!" she screams as she lifts her head from Erika's chest, looking past her and glancing at you with reddened, saddened eyes. "I would be your obedient and willing **** for anything you wanted, if only you would have me!"

Well, fuck.