As you and Hayley slid down the milk duct into Melody's breast, she grabbed your hand; as you slid to a stop, she climbed on top of you and cradled your head against her breasts, doing her best to pull you atop her. As you rolled, she moved her legs apart, and guided you as you penetrated her. A part of your mind was surprised, given the... active... nature of things, that Melody's breast was not rocking back and forth, but the rhythm of your tiny bodies was insignificant to the massive mammary in which you were embedded.
Or perhaps not. For just after your mutual, incredible climax, Melody's voice came through your bracelets: "How are things coming?" with just the tiniest emphasis on the last word. Hayley picked up on it; she pressed the talk button and said, "Ha, ha, very funny. We'll be out in a little while."
Like most men, you were a bit spent and sleepy; Hayley stroked your face, and said, "How about you shrink down some more, and I can give you a ride out of here?" You asked, "How small?" She said, "Just hold the shrink button until I tell you."
When she said, "Stop," she waited and said, "You're actually just a bit smaller than I was aiming for," as she licked her finger and pressed gently down on your tiny body; the saliva stuck you to her finger as she once again inserted you into herself. This time, though, she pushed you all the way up to her cervix and slowly through the cervical opening; the os closed behind you, separating you from her finger and leaving you, a sixteenth of an inch relative to her but only a micrometer in actual height, inside the neck of her uterus.
The combination of the slow cradle-like rocking of her body and the post-coital drowsiness put you to sleep; you were awakened by: