Is My Sister In Law Trying To Seduce Me?

In life, im sure everyone has many encounters with people and was left unsure, if the other person was trying to hint something or not.

This is the story of my wife sister, call her Amina for story purposes.

I have been happily married for 5 years.
First time something happened, after about 5 months marriage, my wife and others in her family was going abroad for wedding (but not Amina, or me).
We all dropped them off airport and then about 10pm at night, she called me. She spoke generally, nothing mischievous and but then her breaths started to get heavy. she did genuinely walk up the stairs and so maybe she was just out of breath. But the formal conversation finished (hi, did you get home ok, no traffic etc) and then she asked, "ok, so what else". And I could feel her breathing was very heavy. I replied and said something else and after that conversation finished, she says again, "ok, what else" and this time round, I could swear she was doing something as her voice was so slow. there wasn't much else to talk about and so the conversation ended there.

Nothing really happened after that, other than I started getting thoughts about her from that day. I'll be honest, I have fantasised about her since but wouldn't even dream of anything happening as it just wouldn't be possible. However, now, about 5 years on, I notice she looks at me times and I'll admit, I sometimes look at her when she isn't looking and every now and then we catch each other out.

One day, she blatantly brushed her boobs on my arms (twice). whilst we were both trying to carry someone ill, across the room. Recently, I was standing on the corridor waiting to say goodbye to some guests who were at her house, and she walked right into my elbow, boobs first! this could have been an accident but somehow I think it wasn't. Very recently, I went to her house, and she was all alone, even the kids were at school. I thought I would test what she would be like, but guess what, she did NOTHING and behaved completely normal, when the opportunity was there for her to do something.

And so im lost, am I mistaken or is she playing games and/or what should I think?
I just want to know what might be going though her head.
She herself is happily married for 15 years with 4 kids. nothing wrong in their family though her husband is a big fat guy, im guessing not very active person.

Any ladies care to share thoughts?

 

Im open minded person, I say what I feel deep inside, however something like this I cannot discuss with anyone, and so I asked on here.
thank you for your thoughts, another opinion is all I needed

 

thank you very much for a great response.
this is exactly what I wanted to know more about - only looking but not buying.
Do girls do this? And if so, why would they do this, seeing as there is no benefit?

 

Or could it be that they are testing me, and behind my back all the sisters talk?
Please help.

To this day, I have NOT made any advances ever, (other than the secret stare) everything I suspect, has been coming from her. She is otherwise a very nice person too, never talks bad about anything, let alone people.