I remember the first time I did that with my girlfriend. She has large, 36DD breasts, and she was laying in bed as I straddled over her and she was sucking my cock.
I was getting too close and didn't want to come yet, so I pulled my rock hard cock out of her mouth and backed away. I needed a break! She loves looking at my dick, throbbing from her skilled mouth, it twitches to my pulse, glistening with her saliva. It is so hard at this point and revels in her praising gaze.
I took it and shifted myself my position back a bit and placed it between her breasts and rubbed it in the valley between her magnificent orbs. She took her hands and pressed them around it, fully encapsulated it. I moaned at the sensation as her lingering saliva gave it the perfect amount of lube.
She said she wondered if she could make me cum like this. I took my cue and began to titty fuck her. This was a first for me, and the sight and sensation was incredible! She watched as I thrust, my shiny, engorged head poking up between them with each stroke.
It didn't take long for me to answer her question.... My climax came as I gave one long push. I watched as my first squirt shot out and hit her chin. I continued to thrust as my cum continued to pump out in a river that ran down the left side of her neck.
I moaned and breathed heavily as my climaxed eased... she had a big smile on her face and said, "That was hot!" And I had to agree!