This is tricky. She could simply be getting more comfortable around you, or she likes to see how much you are going to stare and what you are going to try but has no intention of doing anything (this is the most likely scenario), or your gf has talked to her and if you make a move there are threesomes in your future (least likely scenario, but it's fun to dream).
It COULD be any of those, but don't be silly and ruin everything unless you know for sure. If your gf, your sister, and you are all in the same place at the same time and the sister comes out in a towel or pjs without a bra and sticks her hard nips in your face, see what clues your gf gives you, and only THEN you might have an answer.
Given she is 21 with two kids already...she probably just wants to screw you and it's not going to go well for anyone involved. I grew up around these types; it's my own background until my mid-20s, so I see it from a mile away.
Having had decades of ambiguity among my wife, her sister, and myself, it's not worth the risk unless you are more certain.
|