I read this story on literotica.com between 2007-2010
The story was about a young Indian/Pakistani man who gets to fuck all his female cousins (3 in total). The story details I remember are that first he licked their pussies but they were hesitant to give him a blowjob. The man gets married but doesn’t have sex for some time as his wife is pregnant. They all get together some time later at a wedding. They sneak up to the attic, upper floor room for sex. One of the girls is also married and is known to others as being somewhat of a slut in with her in laws.
Source: reddit.com/r/eroticliterature/comments/od9ecr/help_in_finding_a_story