I love stretchy pants
My wife often wears the stretchy pants or yoga pants or whatever you want to call them, Her friends and sisters do also. I have on many occasions had the opportunity to see a bit of a thong or other kinds of ** since it seems like no girls realize that when you bend over they become see through.
Yesterday my wife's sister was over and apparently she goes commando under her stretchy pants, I first noticed it when she bent over to pet our dog and i was directly behind her. Of course i looked...She has a nice **...But i was pretty sure i got a glimpse of something else and a few minutes later i got confirmation.
I was sitting on the couch and she was kneeling on the floor with my wife playing with our new baby and then she leaned across to grab a baby toy and there it was, It was through black pants but it was obvious with her very nice looking puffy ** lips and her round firm ** pointing right at me. Over the next four or five hours i got to see her ** and ** from behind at least a dozen more times, I have never seen more than ** and i didn't think that it would be that easy to see through them but i am going to have to pay closer attention from now on.
My hot older sister wears them all the time, mostly for comfort, but also admits her ** is perfect (and it is). Was at a gathering with her a few weeks ago, and she'd had a few glasses of wine, so was fairly loose and physical. Besides myself, who did it to her twice, I saw at least 2 other guys, either visitors or friends of friends, ** her ** in tight yoga pants on the way into or outside of the house, in the doorway...One of those "Oh, scuse me" as they went behind her and got a nice handful. Should have seen her laughing. Still took it, though... That's what I mean...She knows her ** is amazing, says it often, and isn't against guys grabbing and groping, especially when she kind of asks for it in those tight yoga pants.... Another gathering next weekend, and I can't wait.
Sounds like your sister wants to experiment with her "inner" feelings. You should take advantage of that, better you than a stranger