Kylie became a regular thing, and I noticed slowly but surely my boyfriend's sex drive becoming a thing only she got to enjoy. As he got closer to her, the cucking intensified. He would go and stay the night, sending me videos at 3 AM of his mouth encircling her nipples, his fingers deep inside her, his hair sweaty, his grunting filling the quiet of my bedroom.
It was more than that, though. A close friend of mine sold nudes, and he would make me pay for them and have her send them to him, so he could look at them while he fucked me. Sometimes, I would hear him masturbating in the bathroom, saying her name - Alex -- from behind the door.
One night, he held me tight by the shoulders and as he pounded into me, pulling me against his chest, he moaned "Alex" into my ear, and I had an orgasm so intense I felt the waves for several minutes, holding his sweaty back as I rode the sensation.
"You like when I call you Alex, you little slut?"
"Yes, baby. I love you."
"I love you, too, Alex," he whispered against my neck, nibbling it.
And as it grew, so did his boldness. When I got home from work one day, my boyfriend was waiting for me. He took me by the hand and lead me to the guest bedroom. On top of the bed was a chastity belt and a collar. Next to it was a dog bowl with water. When I saw the dog bowl, I felt my underwear sticking to me as my juices coated my labia.