Towards the end of last year, I'd been working on a special weight gain serum and trying it out with my Squeakheart, Cobalt. I'd kept it logged in a document and now, after all this time, I've decided to share it with the world. I hope you guys enjoy this weight gain journey as much as Cobalt and I did.


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Entry 1 - November 7th, 2021

My name is Jake, I'm a Buizel who lives on the Isle of Submarine. I've decided to take on an experiment, and log it in this document. What is this experiment you ask? Well, I've always had a fascination with fat furs, and I've wanted to get a feeling for that lifestyle. The problem is that my metabolism is too strong for it to be possible, I practically LIVE on junk food, yet if you were to look at me, you'd think I've had nothing but salad and other foods of that sort my whole life.

Because of this, I've been working on a serum that helps furs with strong metabolisms like me become fat, what this serum does is weaken your metabolism while increasing the calories of whatever you eat afterwards. For example; if I were to drink this serum, and then eat a bowl of ramen, it'd be like if I had eaten 10 bowls with the weight I gained thanks to taking the serum before eating.

The only thing left to do is test out this serum. I've been developing it over the last couple of weeks, but as of now I haven't actually tried it out. I haven't used any dangerous chemicals in this serum, but with experiments like this, anything can go wrong. Which is why I will have someone spot me when I take this serum. That someone being my Boyfriend, a blue anthro Pikachu named Cobalt, whom has graciously agreed to help me out with this experiment.

I'll update this log when I've tested the serum.

Entry 2 - November 8th, 2021

Cobalt arrived at my house this morning, and we got ready for the test. I drank the serum without any trouble, after that I ate a bowl of ramen for my first weight gain meal. I felt stuffed after the meal, and I still feel full typing this a few hours later. I also developed a very subtle paunch from this meal, and I developed a bit of a stomach ache. It seems that the first test was a success.

After a while of Cobalt tending to my full belly, I asked him if he would like to take part in my experiment, he gladly accepted. Though he won't be partaking in the serum until later on.

One of the reasons being that he already has a gut, one like he swallowed a basketball. Why is this a problem? It really isn't, but I want to wait until I have a belly matching his before he begins the process too so that I can see if the effects of the serum vary with furs of different sizes since Cobalt is much taller than me due to being an anthro, at least when I'm in my Buizel form. I have a Lucario form, but I'm not really gonna be using that form because of this reason.

The second reason is so that I can check for any side effects the serum may have. The last thing I want is for something bad to happen to my lover because there was something off with the serum that I missed during development. For now I'm going it alone.

I want to say that my serum was a success, but this is only the first day of testing and I haven't gained much weight asides from a full gut, but I'll keep at it for a few days until my belly matches Cobalt's, then if there's no side effects on my end, we'll both begin our weight gain. If there are side effects, it'll be back to the drawing board, or it'll be cancelled. Hopefully it won't come to those, especially the latter. If it does come to either of those, I have a serum in development to reverse the effects of the growth serum I've made.

Until then, I'll just have to keep at it.

Entry 3 - November 9th 2021
Day two of testing the serum. Today's courses consisted of a few hash browns for breakfast, a plate of chicken tenders for lunch, and a bowl of mac n cheese for dinner. with each meal my belly has distended little by little, now it's poking a few inches out from the rest of me. I had the feeling of fullness after each meal, but it hasn't been as bad as my first one, and it's been fading over the course of the day, I think my body's starting to adjust to it.

Cobalt spotted me during these tests, and during my dinner asked me when he'd be able to join me. I reassured him that after I got my belly as big as his and made sure there were no side effects, that he could partake in the weight gain too.

I said In the previous entry that I wouldn't be using my Lucario form for this experiment, but I think I'm gonna see about looking at how big my belly is in both my forms to see what differences there may be, but that'll be once my belly is as big as Cobalt's in my Buizel form.

I will update this log once that happens.

Entry 4 - November 12th 2021

It's been a few days since my last entry, but I did it. I got my belly as big as Cobalt's. After measuring the circumference of both our bellies, I shifted into my Lucario form to see what effects the serum had on me in that form. I do have a paunch in that form, but it's not too big. It seems that the serums effects vary depending on your size and how much you take at a time. Cobalt will have to take bigger dosages than me for him to make progress with his weight gain. I will keep up the weight gain in my Buizel form until the fat I accumulate becomes too much for that form to handle and then I'll shift into my Lucario form for the rest of the experiment, and in turn I will increase the volume of my dosages of the serum.

Since there has been no side effects over the last few days, Cobalt has joined me. We celebrated with a couple bowls of ice cream, which felt like more than that because we decided to take the serum before digging in. Cobalt's belly seemed to have grown a few inches when he had his ice cream, just like how my own tum had with my first dose of serum, So his intake is sort of equal to mine in my Buizel form.

After our celebratory snack, we went into my room and spent the rest of the night enjoying each other's bellies. Before then I was the one rubbing Cobalt's fat belly and never really had the idea of what it felt like due to me being thin, but having him rub and knead my now-fat gut was one of the best feelings in my life.

It seems that the experiment was a success, but We'd like to continue gaining weight together for at least a couple more weeks before I finish developing the weight loss serum. I'll continue to log our progress here.


Entry 5 - November 15th 2021

It's been a few days since I deemed the initial test of my serum a success, and it's still a success now. Cobalt and I have ballooned out over the last few days, his previously basketball sized tummy has become a full-blown pot belly and growing. My own belly now juts out a foot and a half in front of me and is slightly brushing the ground. The fat has also began to accumulate in other parts of our bodies. Cobalt's butt has become thiccer than it was before, with each cheek becoming the size of a soccer ball, below those bulbous buttocks his legs are like small tree trunks, and his arms likewise. He already had a nice set of moobs before taking the serum, but they're even bigger and rounder now. Even his face has gotten chubbier, between his thickening neck and his slightly plump cheeks, he's looking cuter.

I'm not immune to these changes either, my arms are almost as thick as his yet just as doughier, my own behind is also almost as thicc as his. And my own cheeks have become plumped up too. I've also developed my own pair of moobs thanks to the serum. It won't be long before i have to shift into my Lucario form to manage my new weight better.

Our nightly cuddling has gotten more intimate over the past couple days too, with us both groping more than just our bellies now that there's more to grope besides them. I thought it was nice when Cobalt was tending to my tummy a few days ago, but now that I've become even fatter than I was then and with other parts of me bigger and squishier, it's been like heaven.

Had I known that being a fat fur was this rewarding, I would have began developing this serum ages ago. Speaking of developing, I finished developing the weight loss serum and I will be testing it once I've made it to my ideal level of fatness. Until then, I'm gonna enjoy myself.


Entry 6 - November 17th 2021
My fat has gotten to the point where I had to shift into my Lucario form before my Buizel form became a beached Wailord. I did lose some of the bulk I had gained in my Buizel form, but I fixed that right away with a few bowls of ramen and a few extra doses of serum.

Cobalt and I decided to find a way to enjoy our fat bodies besides just groping and kneading it, after a bit of research we decided to try out sumo wrestling, which we spent the whole day doing. I'd like to say that I'd won most of our "matches", but to be honest, It all blurred together so I'm not sure which of us had the most victories. However, Cobalt did get a few victories in. As for the prize; the winner of each match got to have his belly tended to by the loser, so you could say it was a win either way. I wonder if Cobalt lost some of our matches on purpose? I know I did likewise.

Unfortunately, this is where we'll have to end our weight gain journey. As lovely as it is to be big and fat, neither of us will be able to live our lives this way, and adjusting them to this would be more trouble than it's worth. I've finished developing the weight loss serum and will be testing it tomorrow.


Entry 7 - November 18th 2021

I tested my weight loss serum today, and it worked as well as my weight gain serum did, and quicker too. Within the hour I was back to my normal size and I could shift back into my Buizel form. However, like with the weight gain serum, Cobalt will have to wait a few days before taking a dose so as not to suffer any side effects I might have to deal with. At least this gives me a bit more time to enjoy his nice, fat body.


Entry 8 - November 21st 2021

Like with the weight gain serum, there were no side effects with the weight loss serum, So I had Cobalt take a dose of it and now he's back to having his ball-sized gut and grapefruit-sized moobs again.

After we slimmed down, we reminisced our weight gain adventure. Afterwards, Cobalt suggested that I put my serum on the market. I've considered it, but I don't think the world is ready for my it, and there's the possibility that it might fall into the wrong hands. So the serums will remain a private thing for me, my boyfriend, and a few of my friends who are into fat furs. The recipes for both the weight gain and weight loss serums are in a safe in my basement.

It's been a fun and fattening journey, but like with all journeys, it has to end eventually. Mine ends here, for now at least.


End of Log