You finish what you started earlier.

Back in your bedroom, Carrie now gives you head, while you look at pictures of Athena, and sometimes Athena and Carrie together, in Carries photo gallery.
"You know"...you say, one hand on the phone, the other one resting on Carries bopping head, "I could really see myself with Athena, dont you think?"
Carrie nods as good as she can with her lips wrapped around your Dick.
"Do you think it would turn you on?", you ask, feeling Carrie get faster, "Seeing me with a women superior to you? Someone who could overpower you without a problem? Stronger, more confident...maybe even prettier" Carrie moans around your cock and you feel yourself nearing orgasm again.
"Or would you like to see me with that delivery woman? The two of us having shameles sex in the hallway outside our appartement while all you can do is sit inside and listen? Now you cant even masturbate."
Carrie wraps one hand around the shaft, one cups your balls, her mouth never leaves the tip of your penis as you continue.
"Or should we call your step-sister again? Give her the second key and have you submit to both of us?"
A moan escapes your lips as you nearly reack your climax.

"Theres so many alternatives, I don´t think...I don´t think I´ll ever need to fuck you again."

While this most likely being a lie, with you still wanting to fuck your girlfriend every now and again, these words do the trick. Carrie gets faster one more time and in a giant orgasm you cum down her throat.
She swallows every drop and licks your dick clean afterwards while you catch your breath.