In her bikini cup Shrunk in an Amusement Park chapter 10 by Louka31

She tips her bikini cup forward an inch and slide you in between. She lets go, and you’re snapped against her erect nipple. She repositions you against with fingers, causing you to slide harshly against her flesh, until your face aligns with her nipple.

“Perfect,” she coos. “Now, for fare I expect some work. Get licking.” She “pats” your head, which causes you to slam harshly against her breast.

You lick, causing her to giggle with pleasure. Her laughter causes a minor earthquake for your body. That was mild, however, until she starts actually moving. Each step causing your world to bounce. You continue licking furiously as the only thing you can do at this point.