AQSH-106 - Even after marriage, a sister named Hoshino Natsuki who excessively loves her older brother and forgives everything.

When her husband is away on a business trip, her beloved older brother, who lives in the countryside, suddenly comes to the city. Natsuki, who is close to her brother, is offered to use the vacant room and readily agrees. When she asks her brother the reason for coming to the city, he reveals he broke up with his girlfriend due to sexual issues and came to improve his sexual skills at a hostess club. However, the hostess club he was interested in has closed down, and the frustrated brother suggests using his sister as a practice partner, taking advantage of her personality. Unable to refuse her beloved brother's request, she gradually accepts.