Nancy couldn't help herself, as she felt pulled towards the nipple. Before she knew it, she had the taut flesh in her mouth, and was sucking as hard as she could. Milk flooding into her mouth, and spilling from her lips as she tried to drink it away.
But that was only the beginning. As her clothes unthreaded and fell from her, she found her hands rubbing herself. One pinching and tweaking her own nipples, the other rubbing between her legs. Teasing her own sex.
And even that was but a start to the changes. As she gasped around the milk jetting nipple, and brought herself slowly to orgasm with her own fingers buried into her pussy, her belly began to swell. Quickly she started to look pregnant, then as if she had twins. But it was not until her belly button popped out that it became obvious what was happening.
Her belly button had turned into a thick nipple atop the breast her belly was changing into.