憂とは些細な話題も本音も認め合うことができる親友同士。気を遣うことなく、なんでも話せる気楽な関係。そしてある日、憂のある一言がキッカケで僕たちは一線を超えた。「ねぇ、私のおっぱい見たい？友達だけどSEXする関係てなんかよくない？」恋人でもなく、セフレでもない、ただの友達としての肉体関係。「え…やばい…こんなチ●ポ大きかったんだ。気持ち良すぎなんだけど…笑」いつも通りのノリで接しながら親友とセックス…。なんだか不思議だけど今までに感じたことのない快楽だ。憂のエロ過ぎるデカパイ騎乗位…。上目遣いのフェラ顔。「私たちこれからもトモダチだからね」これは僕と巨乳親友とのエッチで変わった男女関係。

Yuu and I are best friends who can accept each other's true feelings and even the smallest topics. We have a relaxed relationship where we can talk about anything without having to be careful around each other. Then one day, something Yuu said triggered us to cross the line. "Hey, do you want to see my boobs? Isn't it kind of cool to be friends but have sex?" Not lovers, not sex partners, just a physical relationship between friends. "Wow… this is crazy… I didn't know your dick was this big. It feels so good… haha." Having sex with my best friend while acting like we're the same as always… It's strange, but it's a pleasure I've never felt before. Yuu's incredibly sexy big boobs riding me… Her upward glance while giving me a blowjob. "We'll still be friends from now on, okay?" This is the changed relationship between me and my big-breasted best friend after having sex.