っすは英語で？

彼は前進も後退もすまいと決めた。

He decided neither to advance nor to retreat.

オレ、教室で屁をこいちゃったんっすよ。んでもって先生に追い出されちゃって。

I farted in class, and the teacher threw me out.

生粋のお嬢様だからな。残念ながら悪戯とかじゃなくてあれで素だ。

She's pure bred blue-blood you see. Unfortunately that's no sort of put-on but her natural self.

どうやら、さっきのは演技ではなく、素だったらしい。

It seems like that she wasn't acting back then; they were her real feelings.

そ、そうじゃなくて、・・・　素の自分、本当の私を必要としてくれる人がいるなんて、考えたこともありませんでしたから。

N-no it's not that ... it's that there could be someone who would need me for what I am, for my true self, I hadn't even thought of that possibility.