Safe word

[smut alert, don't read if uncomfortable]

"Good girl." He kissed me, the toy began to vibrate filling me with all the pleasure I could ever feel. My head tossed over the wall, his grip around my neck slightly tightened, and then his lips pressed over mine. 

His eyes crinkled, "your safe word is sun in case you need it." He whispered.

I swallowed down, safe word? What was that? The vibration grew more intense inside me almost disruptive, touching cords of pleasure I didn't even know about their existence.

I couldn't even cling to the sheet, so I struggled to cling against the headboard, which vibrated in sync with my body's vibration. I squeezed my eyes.

"You can't come until I ask you to do so, darling, this is your punishment?"