zoophilia free
Due to popular request, here's the first part of my experience of knotting with Buster. The backstory on Buster, myself, and our relationship can be found in my signature under the title "My first time with Buster."
Since I've had so many people ask, I'll start by going into a bit of physical description. (There are some risque pictures can be found in the link in my signature, for the record.) I'm . . . a dwarf. An Irish dwarf. I'm 4'11", I'm redheaded, I'm so pale I blend in with paper. Despite my best efforts, (okay, despite my gluttony and unending love of sweets and salts and all things bad for you, let's be honest.), I hover between a size zero and a size two. And because my boy Buster has his admirers too, he's part pit and part boxer. The vet theorizes he has some dane, as well, because he's not stocky, but tall.
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Now, as mentioned in my last story, our difference in size has taken a bit of work to get around. It took me quite a while of stretching with my fingers and toys to be able to take Buster at all, and I NEVER thought I'd be able to take his knot. Honestly, at first, it didn't even occur to me. It wasn't something I had planned to do, just something I made sure to keep an eye out for, though at first I didn't have to worry because despite his best efforts, that sucker wasn't fitting in, no way no how. 
It wasn't until a few months into our sexual relationship that I even began to consider taking his knot. As I got more accustomed to taking his size, I began to get more adventurous with the positions. I tried missionary a few times, but the height difference was too much, even with the tables I used, and he kept . . .aiming a bit too low, shall we say. (Not quite ready for THAT yet.) I would occasionally ride him, and it allowed me to take more of his penis, but it, quite frankly, lacked the animalistic passion that attracted me to the sex in the first place. I found playing with angles was the most rewarding for me. I padded a low bar stool and bent over it, and the angle aimed him in such a way that I SWEAR I could feel his cock through the skin of my stomach. Probably just lustful willful thinking, but it's quite the hot tought for me none the less.
It was during one of these sessions that I got the idea of taking his knot. He was in me very deep and humping so hard that the place where his knot was slapping against my skin started to sting. I never thought I'd be one to be into pain, but I have to admit the rhythmic slapping and stinging made me hornier than ever, and I came incredibly hard that night. That night, I couldn't sleep because I was so preoccupied with the idea of how it would feel to have his knot slam into me so hard that it entered me, and tied with me, and stretched me to fit just him, because I was his. It sounds silly, I know, but the idea was extremely arousing to me. It was then that I realized I might have a biiiiiit of a submissive streak, or at least an urge to be totally dominated by Buster.
The idea was giving me such vivid mental images and getting me so aroused that I pulled out my vibrator and went for another orgasm. The noise of the vibrator woke Buster up from the end of the bed, and he crawled over, sniffing at me, and began to lick at my hole while I used the vibrator on my clit. This was a favorite trick of his, because when he would lick up, his tongue would hit the vibrator and he'd let out a funny little snorting sound. This had happened several times before, but for some reason that night, with the idea already in my head and Buster's head between my legs, it was what trigged my resolve to take the knot.
As you may have learned from my first story, I'm a bit of a planner, so the very next morning I woke up, showered, and hopped online to begin drafting up my game plan.
More to come! 
Continued . . .
I looked far and wide for something to help train me for Buster's knot. I knew of Zeta toys, but couldn't afford them, and most of the 'bulbed' sex toys were nowhere near the correct circumference to help in my training. I eventually spent way too much money on a bulbed anal toy (the picture is attached below) and attached a base to it so that I could use the handle, as it was comparable to the size of Buster's knot. It . . .well, I won't lie. It hurt. It was so slow going. I eventually got a very tedious system down to a science. It went pretty much like this:
1. Masturbate
2. Repeat
3. Add some Astroglide on top of the natural lubrication
4. Convince my body I was still aroused enough to insert the toy
5. Grit my teeth and go fraction of an inch by fraction of an inch
I got down to the last bulb of the toy after about two weeks of play, and ran into some trouble while trying to take the handle. It was about a week later before I coudl get the top of the handle inside, and I realized quickly that I could get almost halfway down the handle before bottoming out inside of myself with the toy. I still used it to stretch and train, but I had to be incredibly careful not to accidentally pushed inward instead of rotating it around, less it bump very, very painfully into my cervix.
Now, through out this I was still keeping up my regular activities with Buster, and as I stretched myself more and I more, I could feel his knot very, very slowly start to slip through my outer lips a bit now and then during sex. That may sound like no big deal, but comparatively, it was like making it halfway up Everest! Every time it would happen, my desire to take his knot would only grow stronger and stronger. The pain I felt with the toy had dulled down to slight discomfort, which was quickly become lust as I got closer and closer to slipping that last fraction of an inch to the widest part of the handle. 
I have to admit, during that time I almost wore poor Buster out. I was on Spring Break from school, and some days were spent almost entirely masturbating and having sex with Buster. I figured the more practice I got in the better, right? Some days I just didn't bother to get dressed after my morning shower, which drove Buster CRAZY. I have to say, I spent that week as a bit of a slave to his whims. I never knew when I would feel his nose in my crotch, or be hit from behind by 80 pounds of Sex Seeking Dog. I will note, though, that I'm incredibly lucky to have such an affable dog, because after the first day of no clothes and spontaneous sex, and the resulting scratches, his socks were on for most of the whole day.
I guess the porny name for my behavior that week was that of Dog Slut, and, well, I can't really argue. I couldn't say no. I was in a state of almost constant arousal from all the practice I was putting in, and my fantasies about taking his knot were becoming increasingly vivid and distracting. I knew I was close to achieving my goal, and the thought of it was making me impatient and stupid with lust. That very same impatient stupidity had some VERY interesting consequences, but I'm afraid we'll be getting to that in the next part, as the actual story of the first knot is one full of misadventures and excruciatingly elaborate detail, so I'm sorry to say that you WILL have to wait a day or so until I'm fully satisfied that I've described everything as accurately as possible. You know, in the interest of literary integrity and all, .