Wow thats been a long time ago, I think it was my brother in law who was the first to see her tits in all there glory naked, on a hot summer day in our totally fenced of backyard where my then gf (now wife) was always sunning in her bikini or topless.
He and my wife's younger sister came to visit, after some drinks i convinced my wife to go topless since fuck it they where family so who cares
so after some looks between the sisters, she dropped her top and after some talking because sis in law would find her self to unattractive to go topless we got her to drop the top also.
It was awesome! back then no digital camera's so i attached some more recent pic of the sisters to this.
My wife's boobs are bigger then sis in law, but sis in law is kinda chubby so depending on how she sits they look bigger, and she got the most cute suckable little nips i ever happen to suck on also