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You're taking a relaxing walk through the forest.
Finally away from all your responsibilities.
It's been some time since you did this. Just your own thoughts and the sound of the forest and its creatures.

Getting too lost in your own thoughts. You hit your head pretty hard on a tree.
As you rub your head in pain. A weird bulb of sorts drops from the tree. Right on your back.
The force of it making you fall down on the ground.

You barely manage to catch yourself with your hands.

The bulb attaches itself to your back. Turning the skin around it blue-green.
Changes quickly spread all throughout your body. The blue-green skin spreading towards your head, chest and limbs.

Some spots change into a darker color. Leaving you with dark patches all over your skin.

As the changes reach your hands and feet. Your nails turn into sharp white claws. Your hands and feet also change.
Making them slightly stumpier.

Though they still look human enough.
Arms and legs shrinking slightly in length, while growing slightly thicker in width.

The changes soon reach your head. Face pushing out into a short muzzle. Nose shrinking until only two small holes are left.

Your ears move towards the top of your head. Growing into triangular shapes.
Teeth growing sharper. Making two of them at the top visible when you open your mouth.

Your eyes grow larger. Color changing into a darker red.

Hair changing into the same color as your skin.

Lastly you shrink somewhat. Leaving you a full anthro Bulbasaur.

The changes happened so fast. You didn't even have time to push yourself off of the ground.

Focusing on getting yourself up before looking at your changes.
To your surprise two tentacle-like vines come from your bulb. Helping you to get up.

This is going to take some time to get used to.
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I made it during the first suggestion round I did on twitter. 

Doing this mostly for archiving purposes because twitter isn't exactly the best for archiving.