"Well then, Yukino, are you going to be my partner?" Yukino and Iori have been childhood friends since they were born. One day, they are summoned by both their parents and suddenly gets engaged. Marriage to someone with whom she has a strong sense of rivalry and is constantly quarreling------- I oppose it, but I can't help but be happy in my heart! Yukino struggles to make her more-than-ten-years unrequited love come true in the cohabitation life that started when she went on to college. However, she can't get rid of her long-standing habit, and after an argument, she ends up becoming Iori's "sexual partner"...!? It's completely different from when we were children, as an adult, Iori's voice, eyes, and body make my heart skip a beat! 「ーーじゃあ 雪乃が相手してくれんのかよ」雪乃（ゆきの）と伊織（いおり）は、生まれた時からの幼馴染。ある日、両家の両親に呼び出され、いきなり婚約させられてしまう。お互いにライバル意識が強く、口喧嘩も絶えない相手との結婚なんてーーと、口では反対するけれど、内心では嬉しくて仕方がない！大学進学を機に始まった同棲生活で、十数年の片想いを実らせるべく奮闘する雪乃。しかし長年の癖はなかなか抜けず、言い合いの末、伊織の「性欲処理の相手」になることに…!?小さい頃と全然違う、大人になった伊織の声、視線、身体にドキドキが止まらなくてーー