ヤリチンのオレが暴漢に襲われてた大人しいクラスメイト（巨乳）を助けて食おうとしたら逆に巨根ふたなりちんぽ即堕ちした時の話

Just look at that title. There’s not much else to add to that: a horny himbo wants to take advantage of his demure classmate, but it turns out she’s rocking a bigger dick and is even hornier than him. And thus a top becomes the bottom. (Source: FAKKU)