The youngest childhood friend of Kōji, Ichigo, who has been like a brother to him since he was a child, suddenly asks him a question that he can't believe his ears. Koji, who has always loved and spoiled Ichigo, decides to protect him after he anxiously told him that he is gay, "I will protect him!” He decides to confess his feelings to Ichigo when he graduates from high school...and watches over him. However, when another boy confesses his feelings for him at the graduation, he realizes that he has no pulse before he takes action. He is puzzled by his request to check his moaning voice, but he accepts the request rather than leave it to another man. The two one-sided love starts to move with "panting"! A strong-faced, caring businessman and an innocent, pampered, devilish college student are in a nurturing, doting love story with an age difference between them. 「確かめてほしいんだ 俺の喘ぎ声がおかしいのかどうか」 幼い頃から兄弟のように可愛がってきた年下の幼馴染・一誓に 突然、耳を疑うような相談をされてしまった――。 昔から自分に甘えてくれる一誓が可愛くて仕方ない耕路は、 ゲイであることを不安げに打ち明けてきた一誓を「俺が守る!」 と心に決め、高校を卒業したら告白しよう…と見守ることに。 しかし卒業のタイミングで他の男子からの告白を相談され、 自ら行動を起こす前に脈ナシだと気付いてからは想いを胸に秘め なんだかんだと一誓の世話を焼き続ける日々。 そんな中での喘ぎ声チェックのお願いに困惑しつつも 他の男に任せるくらいならと引き受けることになるが オナニーを手伝い、更にはセックスまで求められてしまい!!!? 両片想いの恋が『喘ぎ声』で動き出す!!? 強面世話焼きサラリーマン×無邪気なあまえんぼ小悪魔大学生 年の差幼馴染の育成系溺愛ラブ★