I encountered these words in トロ子’s speech in a game 洞窟物語 / Cave Story.

> …あたしがスーと仲良くすっどキングが機嫌悪くすっがら。

I am not really sure what the words `すっど` and `すっがら` are supposed to mean. I
guess they are contractions from `する` + `と` and `から`. The sentence would make
some sense to me like that.

I am not sure however. What makes me doubt is the vocalization of the `と` and
`から`. In a similar
[question](https://japanese.stackexchange.com/questions/84443/what-does-the-
word-%E3%81%9D%E3%81%86%E3%81%99%E3%81%A3%E3%81%8B-mean), `する` was contracted
to `すっ`, but without changing its following `か`.

Is this actually a contraction of `する` to `すっ`? What is the cause of the
vocalization?

![だけど、もういらね。あたしがスーと仲良くすっどキングが機嫌悪くすっがら。](https://i.stack.imgur.com/nEvmV.png)

### Update

I did some research and found out that this may be mimic a dialect of northern
Honshu.

  * [Examples](https://www.hougen-love.com/dialect_miyagi/miyagi_wassha.php) of a word `わしゃ` from 宮城 contains both `すっど` and `すっがら` in expressions `ばりすっど` and `ばりすっがら` meaning `ばかりしていると` and `ばかりしているから` respectively.
  * [A folk tale](https://www.yamagata-np.jp/minwa/minwa104.php) from 山形 contains both words. There is no translation.
  * [An example](https://fukushimakenpoku.blogspot.com/2009/06/blog-post_16.html) of a word `でな` from 福島 contains `すっがら` translated as `するから`.

My question then remains. Is this contraction of `する` to `すっ` productive with
vocalization of the following particle? What causes the vocalization then?
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grammar colloquial-language dialects contractions
Are すっど and すっがら contractions of すると and するから?
すっがら is equivalent to するから here. I'm not sure why か became が, either an accent
from the speaking character or some touch to make it cute.
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