One evening, while they are relaxing after being intimate, the protagonist asks her the question that titles the story:
「僕にセフレができた理由（ぼくにせふれができたゆう）」は、あいる先生（サークル：あいるあいる）による人気の成人向け漫画作品、およびそれを原作としたアニメ（OVA）シリーズです。 bokuni sefurega dekita riyuu
The protagonist becomes confused. He feels guilty, thinking she might be mistaking this for a real relationship, or he wonders if he is taking advantage of her kind nature. He tries to remind her, "Hey, remember, we're just sex friends." Ichinose usually nods shyly but continues her affectionate behavior. One evening, while they are relaxing after being