When the person opens the carton, you find that it is your older step-sister, Grey. Your 22 years old, uncomfortably attractive step-sister now has you in her fingers and is only taking you out of the carton. Of all eggs, she just had to pick you. If you could, you would be complaining right now.
It isn't that you dislike her. It is more the opposite actually. You are very attracted to her. Your mom had adopted her when you were still a baby after her parents passed. They were friends of her's, so she took Grey in without a moment of hesitation. The two of you grew up together with your younger sister being the third child. And until a few years ago, things were going fine. But then puberty hit you like a truck and suddenly you realized just how hot Grey actually was.
To make things worse, Grey is pretty open about many things which most people aren't. She likes talking about various adult things with you. Only you though. It use to be your thing that the two of you often did when growing up, and this has stuck around well into her adulthood. She often tells you about any weird or interesting porn that she discovers and she even sends you pervy messages to pass the time when she is bored at work.
And for this reason alone, you now are very worried about what is going on in her head right now. A few days ago, she had sent you a few links to pictures and videos of hot girls both inserting and then laying eggs. So the moment Grey steps out of the kitchen and heads for her room, you figure out exactly what's going on. She is going to try that stuff out, using you.
Sure enough. The moment her door closes behind her, Grey pulls off her short shorts, her thong, her shirt, and her bra and climbs on to her bed with you in her fingers still. She then pulls a jar out from a drawer and then rubs you around in the substance inside it. It clearly is some kind of lube and has successfully blinded you. You can't see anything but a blurry light as you are now fully coated in lube. She then slowly but surely spreads her legs and pushes you inside her pussy.
You want to stop her, but you are just an egg. You don't get a say in this. You can only watch as the light disappears from view and a warm, slimy feeling encompasses your entire form. You can taste and smell her pussy and you wish it wasn't turning you on. Though you still are just an egg, your body can still "feel" arousal and the feeling of an orgasm.
Your Sister stands up and from what you can make out, she has not only put her clothes back on, but is leaving the house entirely. You hear her say goodbye to Mom and then get into her car. She has work today for a half day, and so she must be heading to the office for a few hours.
Indeed that is the case as when she steps out of the car, you get a moments glimpse of her foot in her 5 inch platform pumps she often wears to work. She is the secretary of some corporate big wig, though she often doesn't do much in terms of actual work. She has told you quite a few times that she is basically the office's eye candy. She loves her job, so you never said anything about that.
You hear a few muffled voices greet Grey as she sits down at her desk. Many of them are men, but the more seductive greetings actually come from the women. It only dawns on you now that in order for you to have seen her footwear before, means that Grey currently isn't wearing underwear. This gets confirmed when a finger is inserted into her pussy and nearly pokes you.
You feel Grey shiver and moan a but as a sexy woman's voice invites her into her office. Grey agrees and you feel her walk into the nearby office. She then sits down on something and has spread out her legs apart. Because of this, you can now both see a small bit, but more importantly, you now can hear everything clearly.
"You do indeed learn things quite quickly Grey. I can see you were indeed telling the truth. Not 2 days have gone by and you already don't need me to tell you what basic behaviors are expected out of my pets" Says the unknown woman with a clearly superior tone than Grey. Grey is getting horny and you can tell first hand that this kind of play is turning her on a lot.
"Hehe, well I consider myself to be quite above the average pet. So I don't disappoint my owners, if I can help it, Mistress." Proudly declare Grey.
"A prideful pet... not a typical combination, but I like you eagerness so I'll allow it. Plus you know your place already and I didn't even need to tell you not to wear panties to work anymore."
"Of course, that is the basics. Mistress Miranda made sure to train me quite well when I first was hired here. I take my role very seriously too. I am the office pet who only serves the current owner, whomever they are. You are the current owner, thus I am your pet, Mistress" explains Grey.
"Lovely. Now then, what can you show me today? Have any special tricks up your sleeve?"
"Indeed I do, Mistress. I can lay an egg."
"Ooh kinky. Show me."
Grey nods and stands up on top of the desk. She then squats with her knees spread apart and places her hands below her pussy. You feel yourself be squeezed and slowly pushed towards the front of her pussy. Soon you plop out I to her hands and are presented to Grey's boss/Mistress. The older but very sexy woman is smiling and picks you up. She gives you a kiss and hands you back to Grey. "Interesting trick Grey. Now do it in reverse." Grey nods and shoves you back inside her pussy.
"Good girl. Now keep it there inside of you until Sunday night. Then lay it again and video tape yourself doing so and send it to me. If you can do it without breaking it, I will give you a raise. If you cannot, I will punish you for a week."
"I understand Mistress!" From the sound of it, Grey seems to be excited for this and from the feeling of it, her boss/Mistress treats her well enough too. "So, how are things going with that brother of your's?"
"He still is attracted to me" replies Grey. You feel a bit remorseful for this. "Oh? Well aren't you a lucky pup. Just keep at it and I am sure he will come around. It's not like your blood relatives anyways right?"
"Yeah, we aren't! So there is still hope!"
"You should just tell him. Though it is a bit unusual, it isn't the worst idea. Who knows, he may even say yes. As your Mistress, but also as your FWB, would it help if I ordered you to ask him? I could if you want me to, though that would be mixing your work and home life."
"Thanks, but no thanks Kelsey. I want to do this myself. If I need my Mistress to order me to, then will I need to ask my Mistress if I can have sex with him, sleep with him in the same bed, date him, etc...? I need to do this without relying on an order, or else I won't be able to do it without needing you to give me permission to do the things I want to do with him."
"Well, there is no shame in that. Though I do hope that perhaps one day a threesome invitation will be on the table for me. I am reluctant to relinquish such a well trained pet without any kind of compensation after all" grins Kelsey who rubs her finger around Grey's pussy, sticking it inside to playfully poke you a bit. The two of them spend quite a while messing around with each other this morning, with you having a front row seat to all of it.