Get a piece of glass cut to the same length and depth as the tank, 3mm thick.

The other, thicker length of tubing was in Modesty's hands now.

Finally she reached out to him, needing that thick length of his to fill her up.

I clasped the long, thick length of his erection in my hand.

The hard, thick length of him jerked at my first touch.

Slowly, he pulled back, drawing his thick length from her depths.

She stood by, swinging a thick knotted length of rope.

When my hand slid between our bodies so I could cup the hard, thick length of him, he shuddered and cried out.

"I'm more than ready for you," she murmured, taking his thick length into her palm.