Ok, since there are no other volunteers... I'm probably not quite on the same page as the original poster, but here goes.
As my user name suggests I am primarily into cunnilingus (see my thread
https://www.freeones.com/forums/threads/tell-us-of-your-best-irl-cunnilingus-experience.985602/ ) but tittyfucking comes a close second. I'm Swedish, working in health care, now approaching middle age but I do have some fantastic sexual experiences behind me...
This was more than a decade ago, an encounter with a Spanish girl who was visiting Scandinavia in her work. Normally I have a huge thing for dark skin and brown or black nipples but this girl had pink nipples and very pale and flawless skin, just that shade of Mediterranean dusky rather than Northern pink. Black eyes, black hair, black eyebrows just a touch on the heavy side and the fine hairs on her forearms darker than my own much fairer hair (no, she wasn't hairy) to match her pale skin as a reminder of her south-European heritage. She was slim and fit, with very obviously enhanced breasts (I generally prefer them natural) , so firm they would hardly move at all if she jumped, one of them decorated with a couple of black stars tattooed above one pink nipple. Even if she didn't conform to my usual fetish of darker ethnicities she really was beautiful in a Snow White" white-as-snow-red-as-blood-black-as-coal" sort of way.
During our session I had had plenty of opportunity to knead and caress those unnaturally firm breasts, especially while she straddled my mouth and my hands were free to roam across her body. Being on the receiving end of oral sex has never been my thing (yep, I'm in a minority) so unsurprisingly she hadn't managed to get me off that way, but I figured I just might manage to get myself off between her silicone tits...
We added some oil, I straddled her chest and she cupped her breasts with her hands around my shaft, locking her fingers above it to keep me from popping out again (yes, they really were that firm!) while I started pumping back and forth. Because her breasts were like two perfect unyielding domes they really didn't meet around my erection, it being more like I was rubbing myself against her sternum, some little extra stimulation afforded by the valley "walls" created when she tried to press them together. Not ideal, but hey, I was fucking my first pair of silicone enhanced tits which was an odd thrill in itself.
I switched back and forth between tittyfucking and nipplefucking her chest, having her cup both of her hands around just one breast at a time, holding my erection in place with her locked fingers while I thrust, rubbing the head and shaft of my cock back and forth across the hard nipple, something she clearly liked. My pre-cum was leaking out, leaving wet trails across the tattooed stars on her chest.
Then I asked her to talk to me in Spanish while I fucked her tits, telling her what an incredibly sexy language I thought it was. She gave me an absolutely wicked grin and then began to tease and regale me with her husky voice as I rammed my cock back and forth between her breasts. I don't know any Spanish and the only word I really understood was her frequent references to her "tetas", but it was clear she was asking me if I liked them, if I wanted to cum between them, etc.
My erection went from respectable hardness to steel-bar rigidity, just from that voice! I was looking down at this Spanish beauty, smiling up at me, flashing dark eyes, her long straight shiny black hair cascading over the pillow. M y cock was between those ridiculously perfect half globes, glistening with a mix of oil and pre-cum. Her husky voice kept encouraging me as I fucked her tits faster and faster, towards an inevitable climax...
I remember being struck by a sudden thought through a haze of mounting pleasure, that I didn't want to spoil her beautiful black hair by making a mess in it, and at the last second managed to put my hand in front of my spurting cock before I drenched her neck and the long hair spread across the pillow. Instead I ended up glazing her breasts with what seemed like a never-ending series of long jets of cum. My right hand was already soaked in it, so I spread the warm mess across her chest with both hands. She grinned at me and crossed her arms above her head while I was kneading my cum into her breasts and nipples, rubbing it in, anointing that flawless white skin.
Don't know if that qualifies as the "dirty talk" the OP requested, but it sure worked for me...