Step daughter. And while it wasn't sent to me, it was one of those "Can you take a look at my computer? Oh, I forgot I had those on there!" situations :D

Sister looks like her. At least a little bit
 

Was lucky enough to catch a glimpse of my sister in law showering at our house. She had come in from the pool and the door to that bathroom doesn’t catch unless pushed hard. I heard the shower and had to check.

Wow, she’s so hot. A little heavier than my wife, but not fat by any means. Slightly larger tits (my wife a 36C). Her sister is a “blonde”, but I was able to prove she wasn’t. A nice dark patch of pussy fur just like my wife.

When my wife came in later to shower and change in our master bath, I had to take her. Right on the bathroom floor. She wanted to know what came over me. I wanted to scream her sister’s name as I came.

Sisters
 

First one is my fiancee second is her older sister

I've posted some of this before, however, it fits here. So many years ago, we were on holiday with my wife, her sister, sisters husband and another couple. By some miracle the girls all went topless. All 3 had great breasts but I have to say my wife's were better than her sisters (the friend beat them both). As the years have gone by I've now managed to see the sil naked (she has no idea) and I still say my wife has the better body. Although they are both great to be fair.

I've been lucky both my wife and her sister like to be naked on the beach and in the sauna.
It took a couple of years before they went naked when my BIL or myself were present, but ever since we've seen each other naked on multiple occasions.
When comparing them, both my BIL and I came to the same conclusion.
Both women have the same shapes and curves, only the curves of my SIL are a bit bigger.
So their breast and nipple shape are similar, only my wife has a C-cup and my SIL a DD or E cup.
Also the lips of their pussy are similar shaped and both smooth in summer, trimmed in winter.
Finally their asses. Both still kinda firm and tight (for being 40 and 43 (SIL)), but again the one of my SIL somewhat bigger (which my BIL really likes).

No pics of SIL, both there are some around on this site of my wife, so you can have a fairly good idea of SIL :)
Maybe in about 5 years, I'll make another post to compare SIL and niece when she has grown into a young adult :cool:

I've seen my future MIL nude for an extended period, and she shares many similarities with her daughter. Besides being a little taboo, it certainly was interesting to compare the two. Mom has aged well, and all I could think was that I have a lot to look forward to ;)

It's always good to see mom cause that is what you can expect you wife to look like later on.

SIL during skinny dip
 

Been very fortunate to have seen my SIL, older than my wife by 4 years. She’s a little thicker than my wife, but not what I would call fat or unattractive. Her tits look a size bigger (wife is a 36C), little bit larger legs, ass, and through torso.

Happened to be a time last summer we all went skinny dipping after some drinks. I can’t remember who suggested it (maybe SIL), but it didn’t take much selling the idea. Me, my wife, SIL, and her husband.

The other bonus, was finally seeing SILs pubic hair. She has a nicely shaped thick triangle like my wife. Both ladies are mid and then late 50’s. In fact they are almost the same looking beaver, my wife has dark brown hair, her sister has always had “blonde” hair, but I knew it wasn’t natural. I now have proof. Nice dark fur like my wife’s.

Both the guys enjoyed seeing the respective SIL. We showed that, the way men have always voted without words.

This is awesome! Were you doing a good job of hiding your erection? How about your SIL's hubby? Would you ever considering trading naughties of your wives with each other? Might be too risky to bring up.

Neither guy did a good job of hiding our erections, and not sure he tried (I didn’t). Just one of those things. Too risky to trade or even suggest it in real life, for sure. I’ve thought about it in fantasies, both while solo, and when I’ve been with my wife. Had BIL? I’d imagine so. Some things better left unsaid.