Eventually

Sophia plays with her cunt until she cums for a fourth time, the tub almost entirely full. Her chest heaves as she breathes, but she finally reaches over to you and grabs your balls hard. The pain travels straight to your brain, but it does the job and you stop cumming. Like a faucet, you've been turned off, and the last few dribbles escape the tip of your dick before it starts to soften again. Sophia brings her hand back into the tub and rocks back and forth, caressing herself and spreading your warm semen all over her skin and in her hair. Your discomfort escapes her in her bliss and you take long, slow breaths to help slow your heart rate. Now that the pleasure has ended, your dick throbs in pain, feeling raw inside and out. Still unable to move, you are **** to watch as your friend rolls around in a bathtub full of your cum, humming pleasantly to herself.