Based on the erotic game Shin Hitou Meguri by Potage. 
 
Telling a Beautiful Girl's nephew from the innkeeper's home. Where the Beautiful Girl is very close to his own uncle who served as Security at the inn. One day, this beautiful girl had sex with her uncle in the inn room. 
 
(Source: Nekopoi and Has Been Translated)

Based on the erotic game Zoku Hitou Meguri by Riddle Soft. 

Mao, who has a secret crush on Mikio, makes up her mind and invites him to go on a trip. The invitation gets accepted, and at the thought of the trip just for the two she feels elated. Mikio falls asleep right after installing himself in a seat opposite Mao in the train, helplessly spoiling the sport. She expands her expectations looking forward to upcoming events, though his seeming lack of interest dampens her ardor a bit. Despite her hopeful view, however, it turns out that her passion for Mikio only ends up arousing the sexual desire of a man that appears unexpectedly... 
(Source: AniDB)

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