My first encounter with Monty

This isn’t something I ever thought I’d write out, let alone let anyone else read, but it never really occurred to me that anyone would want to, or that there was anyone else like me. Hell, I didn’t even know I was like this before Monty.
I’ve been dog sitting for several months now just as a way to make a little extra money on the side. I’ve always loved dogs and it’s nice to stay in other people’s big fancy houses for a few nights, away from the real world. I’d housesat for this particular family a couple of times before, so I already knew and loved their magnificent Rottweiler, Monty. He was about four years old and absolutely gigantic, at least 125 pounds with a soft, gleaming coat and expressive brown eyes. He liked to sit and watch me, his brow lifting and furrowing to follow my movements around the house. Of course he wasn’t all grace and beauty, at times he would sit and sloppily smack his thick tongue over his massive balls. At first I was a little alarmed by those things – most people neuter their dogs these days – and those testicles just hung their, huge and low, swinging between his legs as he swaggered around the house.
It was my third night at the house, a Friday, and I was feeling pretty bored and a little stressed from a long week at work. I stripped off my clothes and just put on a little pink bathrobe before settling on the couch with a glass of wine. I was just surfing through the hundreds of cable stations when I came across a porn channel. I lingered there for a while, swirling my wine. I’ve never been too into masturbating, but I was so wound up that I found my free hand wandering down between my legs. I’d just gotten waxed the day before so it felt wonderfully smooth. Maybe it’s just because I’m young (I’m 22), but I always get very wet very quickly, and even though the porn was cheesy – bad lighting, pulsing music, absurd groaning – I was dripping in minutes. I slid out of the bathrobe and spread it across the sofa so as not to get any mess on the upholstery and set down the wine so I could use my other hand to play with my nipples: small, pink, and quick to harden. I rolled them between my fingers while my other hand rubbed my clit quickly in a circular motion.