He could feel the soft fluttering of her internal muscles, but she didn't move.

She squeezed her internal muscles on his large head and he cried out.

When you to this your are making use of internal muscles which can be strengthened by exercise to give you greater control.

"That's just one internal muscle moving," she said.

Beneath the internal muscle layer lies the body cavity.

Suddenly she shuddered, and her internal muscles milked him.

Those internal muscles of hers began to work, and she deep-kissed me simultaneously, her tongue mimicking the action below.

Rose squeezed some internal muscles that took him over the edge.

Most she finished with a few short smooth clenchings of her internal muscles.

The tip touched the waiting hole, and she clenched her internal muscles.