After a methodical examination of your new form, Celeste seems immersed in her thoughts, divided between excitement and apprehension. Suddenly, the bell of the local church resounds in the distance. Your sister takes a deep breath and straightens up.
"Seven o'clock already? It's high time I get ready, little brother, if I want to make it to my job on time!" She reaches out her huge hand and lifts you up, careful not to confuse you with your twin, placed next to you for comparison. "But I won't go without you! My little jeff, get ready for an intense weekend of discovery and pleasure! Like I said, most of the time I'll just treat you like the object you've become. But I will think of you every moment with love."
She gets up, walks out of the room and silently makes her way to her room, whose door she carefully locks. From your high position, in the hollow of her hand, you see between her long thin fingers the familiar decor of the place. Everything here reflects Celeste: the softness of the white and pink wallpaper, the furniture, so small and cute that it seems designed for beings from another time, but which perfectly matches her relatively short stature, the photos of family and friends hanging on the wall and even the sweet and fragrant smell that reigns in the room and contributes to make it her undeniable territory. The bed is made and there is a perfect order and cleanliness: no objects lying around, except for the pants and top she wore the night before, carefully placed on the desk chair, for some open textbooks on the table and for her purse, placed on the floor next to the nightstand. The room is filled with a pleasant warmth, Celeste being used to sleeping in her underwear.
Lightly and still without a sound, your adoptive sister sits on the edge of the bed, facing the large mirror on the dresser. It is then that you discover for the first time the new shape that is yours. Even though you know it, your brain struggles to accept the information: the reflection that appears is not yours, but that of Celeste who dominates you with all her immense size. Facing you, at the height of her slender hand, there is only a small metal orb which weakly reflects the light of the lamp. From this point of view, Celeste seems even more beautiful and majestic. Her breast stands out proudly, round and plump, in her night bra, and you contemplate her longingly. On the bed, between her two legs, you distinguish that her slight camel toe is still there and that a thin line of moisture seems to have formed, testifying to her excitement about the situation.
"Are you ready?" asks Celeste? It's a rhetorical question, of course, because you don't have the ability to answer, or even make the slightest movement. But if you could, you'd shudder all over with anticipation and desire and your cock would be harder than ever.
Celeste lays you down next to her on the bed and the comforter sinks slightly under your weight, but you can still see the mirror and from this lower point, the girl looks even more imposing. Slowly, she unclasps her bra, revealing her two gorgeous breasts, topped with two cute, hard, dark red, pointed nipples. Even if, as children, you did not know modesty and even took sometimes baths together, you had not seen them since nearly ten years, before she reached puberty, and they were today quite different. Hypnotized, you do not manage to detach your glance of it, until Celeste, by continuing her undressing, seizes the elastic of her panties with her two hands and makes it go down along her legs. Her movement is intentionally long and erotic, revealing millimeter by millimeter the secrets of her femininity.
A small, thin and fragile pink pussy appears, topped with a little bit of blond hair, the same color as your sister's hair, but more curly. It's so cute and natural that you feel overwhelmed with love when you see it. Your throat would be filled with emotion if it still existed. Calmly, her hand comes to pick you up from beside her and lifts you up again. Gently spreading your legs, she holds you facing the mirror next to the small entrance. From where you are, a light perfume already reaches you and fills you with excitement. That's when you realize how big you actually are, huge even. It didn't strike you when she showed you the little metal orb, never having had a girlfriend, but you occupy most of her palm and her long fingers are unable to reach the other side of your form. She has a very small hand, but still! Her young sex seems to you very small in comparison, and especially narrow. Wasn't she too ambitious in choosing this toy from mom's arsenal?
"I didn't lie to you, it's the first time for me too," she said softly, to make matters worse. "I don't know exactly how I'm going to do it, I'll admit it won't be easy. It would have been easier to have lube, but I didn't dare borrow Mom's, for fear she'd notice the level in the bottle had dropped. Besides, the taste might be unpleasant for you." Lowering her left hand to her moist sex, she rubs it up and down twice with the flat of her hand, then stops at her clit, stimulating the area. While she is officiating there, she moves you to her chest and rolls you between the two giant breasts, from where her sweet feminine smell rises, then on their curve and against her nipples. You are at the height of excitement, since your whole form feels like your cock, and also because you are stimulated by the new and delicious spectacle of your sister pleasuring herself. You observe how her breath quickens and how moist her chest becomes. Suddenly her whole body seems to tense up and she can't suppress a moan of pleasure.
"Wow, that was good! I've never had that before, the very idea of having you inside me is blowing my mind, little brother! I hope mom didn't hear anything. Well, I think the ground is now pretty well lubricated! I don't have to hang around much longer if I don't want to be late, although I've decided to postpone my shower until tonight to save time." Deep down, Celeste also wants her younger brother to experience the authenticity of her female body, with its natural smell and aroma. She has impeccable enough hygiene to make it all the more enjoyable for him.
Slowly, Jeff feels himself moving down her slim belly, to her cute belly button and beyond. Suddenly, he feels the soft touch of her little pubic bush, at the same time that the scent of her sex starts to become more present. Celeste slowly rolls the little orb against her still half-closed pussy and lays it on the bed, facing the large entrance. At this point, the smell is very strong and musky, but it pleases you a lot and makes you melt with desire. The small entrance stands in front of you, still seeming too narrow. A thin opening lets you guess the translucent darkness that reigns there. Celeste presses gently on the ball and leaves it against the small pussy, in all its length. You can already taste it, it tastes salty and a bit metallic, but you love it already.
Taking a deep breath, she slowly increases the pressure, and you feel her lips tighten around your spherical form, which stimulates you beyond comprehension, your whole being sensitive as your cock. She spreads her lips as far apart as she can with her other hand to help you pass, but it keeps blocking at the widest point of the orb. Several times, she goes back and repeats the same movement. Around you, the pressure is at its peak. Your sister lets out a grunt: it's a little painful for her. Then, abruptly, the pressure decreases while your whole body is swallowed up in Celeste's little vagina.
"Phew, we made it," she says, panting! I thought it would never pass." Looking into the mirror across the street, you notice that only the back end of your spherical form still protrudes from her open vagina. "The sensation is very amazing," says Celeste, "but I love it. I feel stimulated! And with a lively gesture, she starts stroking her clitoris again. You feel the heat, the humidity and the smell, already intense, still accentuate around you while she caresses herself with more eagerness than ever. Then, again, her body tenses and you feel her whole sex contracting around you rhythmically. As she climaxes, she presses with her index finger on the part of you that still protrudes and plunges you far, far into her vagina.
The opening, greedy, closes behind you and you feel your whole universe moving while your sister collapses on her back, breathless. Darkness surrounds you now and you are bathed in the intense warmth of her body, soaked in her omnipresent smell and taste, caressed by the micromovements of her vaginal walls, which twitch with the rhythm of her heart and breath. Everywhere, everything is only Celeste, everything is only the glory of her femininity. You are moved and ecstatic. Very grateful. You are in heaven.
Then...