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Adult content. This work is rated 18+. The images stay hidden until you confirm.
Tags
Incest Features sexual or romantic relations between characters who are related by blood.Female Harem Main cast features the protagonist plus several female characters who are romantically interested in them.Heterosexual Prominently features a romance between a man and a woman, not inherently sexual.Flat Chest Features a female character with smaller-than-average breasts.Nakadashi Creampie; features sexual ejaculation inside of a character.Onii-chan, Asa made Zutto Gyutte Shite!
お兄ちゃん、朝までずっとギュッてして！
The protagonist is an older brother who lives with his four younger sisters. Due to his past severe asthma, a routine was established where one sister sleeps with him each night to provide comfort and care.
Their parents, who are researchers, introduce a new experiment to improve his immunity: he must hug the sister he is sharing a bed with affectionately for at least 10 seconds every night. This simple directive leads to increasingly intimate moments as the sisters themselves establish their own affectionate rules for these nightly embraces.
