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Episode 1 of Temporary Replacement!
[ENGLISH SUB AND NON SUBBED VERSION AVAILABLE ALONG WITH CAPTION FILE FOR YOUR OWN TRANSLATION]
Justin (19) is a college student. He recieves an special opportunity to study abroad and ends up staying with his sister, Alex (26), and her husband, Dexter (31), in Tokyo since they live close to his program. Alex is 7 months pregnant, but allows her brother to stay in their guest room until she gives birth.
While Justin has always had a close relationship with his brother-in-law, he catches Dexter watching p0rn in the living room in the middle of the night. Dexter confesses that his wife decided they stay celibate until their baby is born, meaning he's been deprived of sex for the past 7 months so he often has to masturbate in the living room so he doesn't disturb her.
This ends up leading to some interesting situations when Justin eventually offers to help him out until his sister gives birth!