Before either you or Hayley could react, Melody started shrinking, her head dropping below your view from the bed in seconds. In another few seconds, Hayley reached down and picked her up, and placed her on the bed next to you. Melody was still about six inches tall, which made you about six inches tall relative to her - and her about 75 feet tall relative to you, and, incidentally, quite naked, having shrunk out of her clothes just as you did.
As Hayley undressed, Melody picked you up and whispered, “Don’t hold back,” and then looked you in the eye with an I really mean it kind of look. Then, suddenly, Hayley grasped Melody, laid down on the bed, and placed Melody on her chest. “As they said in Princess Bride, ‘Have fun storming the nipple!’” said Hayley. Melody stretched up and placed you on Hayley’s nipple, then hung onto the nipple with one hand as she held the “shrink” button on her bracelet with the other. In a few seconds, you helped your sister up onto Hayley’s nipple with you, about normaly-sized, relatively speaking.
“We’re a quarter-inch tall, give or take,” said Melody, “and we need to be about one-eighth of our current size.” You said, “Let’s take it slowly; we don’t want to fall in before we’re ready.” At your current size, you could already see the milk ducts in Hayley’s nipple ready to receive your tiny bodies; the biggest by far was very close to the center of the nipple, and you both positioned yourselves to be able to enter it.
You each shrank down to a 1/32 of an inch, and jumped into what now appeared to be a 20-foot wide abyss leading into Hayley’s breast.
As the two of you slid down the milk duct, it slowly curved and narrowed until it was almost level; you walked until it became too narrow to stand, and then you crawled on hands and knees, with Melody taking the lead. From behind, you had a rather arousing view of your sister’s nether regions, and you said, “Hey Melody, you did say ‘don’t hold back,’ right?” She giggled, and said, “Yes indeedy!”
“I’ll tell you what, sis; pick a spot on the floor, and examine it really closely; I mean, get your face right up to it so you can really see it.” As Melody did so, her hips tilted and her legs moved apart to keep her stable just enough, and you moved up behind her and slipped your penis into her vagina from the rear.
“Oh!” Melody gasped, “That feels so incredible,” as you reached around her body and cupped her breasts, moving into and out of her. You could hear her start to make little stifled noises, and you said, “Don’t be afraid to make noise, sis; nobody’s going to hear it but us at our size.” Her squeals and grunts got a lot louder, and she said, “I think I’m coming,” and I felt her vagina clamp down on my penis. Then you turned her over, entered her from the front, and kept on pumping; before you came, she orgasmed three more times. You relaxed onto her, and fell asleep momentarily, but awoke when she asked, “You must be tired after that. Since you’re already partially inside me, why don’t you shrink down further and ride inside me while I climb out?”
“I’d love to,” you said, and held the “shrink” button until you were about a quarter-inch relative to my little sister. Having shrunk toward my center of gravity, you were already positioned against her vulva after shrinking; her finger pushed you all the way up into her vagina and into her cervix. “There,” she said, “now I’m sure you won’t fall out.”
You relaxed inside her; as she got up and started walking up the milk duct, you felt the rocking motion of her hips, like a baby - or a big brother - in her womb, you thought, remembering that the cervix was actually part of her uterus. The gentle rocking lulled you to doze off for a few minutes.
You were awakened by Melody’s voice from your bracelet. “Matt, you’re going to need to come out of there so I can grab you and pull you out.” So you pushed out through her cervical os into her vaginal vault, and moved to where her fingertip was already waiting to drag you out of her most intimate parts. Once out, you both grew up to a few inches tall.
“So how’d it go?” asked Hayley.
“Well,” said Melody, “we went into the center milk duct, which was just huge, and then we walked in, then crawled, and then Matt went inside me from the back, and then from the front, and I came four times, then he shrank down and I pushed him up inside my cervix, and I climbed out and pulled him out of me.
“So I think that you and Matt should go inside my boob so you can have him inside you both ways, too.”
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