"The wall opposite that one was also bowed outward, though more slightly as though tugging against the other side of the crooked house and preventing it from tumbling down."

Think you could lose the "though more slightly" and the sentence would read more easily without changing the meaning.

"The only insight as to why was that it’s builder, who a bitter old man from his youth onward, had called the twisted mansion “Paragon House”, and so had perhaps built it in its odd, misshapen and leaning way as a commentary against the Paragons of the highlands, who were normally held in quite high esteem in every quarter."

Seems like a word is missing in the "who a bitter" section?

"This was known to the rest of the folk in the town upon the larger plateau to which the pillar that held the crooked house adjoined,"

Had to read that a couple times to get the folk > town > plateau > pillar > house relationship correct. Maybe this part of the sentence is just trying to do a little much?

"Twenty years before, when the current generation had been freshly conceived, the crooked house held near a dozen members of the House of Yso, all but one of which had met their ends, whether by age like the old patriarch and matriarch of the House, by disease, or by some misadventure or other within or around the crooked house itself."

Sounds a little odd to have "which" referring to the people here. Maybe "whom" instead?

"Creeping through the house, now realizing he had more than his own conscience to answer to, he wought the two women who now shared his abode."

Sought?

"Jacob Yso found them in the parlor, his lover sitting with his sister resting her head upon her lap."

A little tough to grok whose head is on whose lap.

"Ellia stood, leaving the blind daughter of the House of Yso to weep alone. Jacob, who had killed for her, who thought he would have died for her, stood dumbfounded as she approached."

Again, just a little pronoun confusion here, since the "her" is Ellia but another woman has been mentioned in-between.

This line:

would benefit with some dashes (as in, "front- and back-most walls"), because it literally took me several re-reads of that line to understand what you meant.

I may be unused to reading such poetic descriptions, but this line:

Made me question for a minute whether there were two people crossing the bridge or whether it was two descriptions for one person.

Punctuation:

Needs another comma, between "Jacob Yso" and "was soured."

Typo:

Should be "sought."

Typo:

Not sure what it's supposed to be. I think it's "their pale blue" (in reference to her eyes).

And I really don't mean any offense about Skin Deep; but I would really like to see it taken a few degrees further, to see you fully display your talent on/with it.