Sister in law is spying on me, go further or not?

I got a wonderful girlfriend, sweet, smart, but with a very low libido. The sex we have is good, but to my opinion way to little. So, I kind of can't get my sexual needs satisfied. So, I need to masturbate, and fantasies. She has a younger sister who is often staying over at our place many times for multiple days/weeks at a time. Now last week she had to get a ride early, and I would drive her. I put my alarm on, but I apparently slept trough it. As she was going to be to late if I did not get up quick, she decided to wake me up. Now to the point. I did wake up from something I remember (she might have knocked or called my name), then I heard the door open (I assumed it was my girlfriend going to the bathroom or something), and then a while later she called my name from the door opening. I turned my head around facing her, and noticed that I had push the sheets away during my sleep, and so I was lying there naked with a hard morning erection. I quickly pulled the sheet over me, and acknowledged that I was awake and that I would be dressed and ready to drive in a minute. Later on I realized, there was a reasonable long time between that I heard the door open, and that she called my name. Was she watching my naked body before she decided to call my name? Now when I when I got out of the room dressed, and went to brush my teeth, she was there too brushing her teeth. I kind of avoided her look, as I knew she had seen my erection. And she had avoided my look. But one point our eyes met, and there a short, but intense look between us. Now after that things seems like normal, although she is wearing looser clothing that normal. Which gives me more chance to see glimpses of boobs or ass. Now the question. Is she in to me? Was she really spying on my? Should I try to go further? I would love to fuck her, in secret or together with my girlfriend in a threesome.
Updates:
+1 y
Well, we got a step further. My girlfriend came to bed after me, and she ALWAYS closes the bedroom door. But after I woke from something early this morning, I heard the little sisters bedroom door quickly close. And our bedroom door was on a crack and the bedsheets were on the floor, so both me and and my girlfriend were uncovered. I had an erection, and my girlfriend was half lying on me sleeping. My conclusion is that the little sister opened our door and was spying on us/me. :)
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Most Helpful Guys

  • Ok, Time for threesome bro. Now fake that you are sleep yesterday and caught her "Red handed" don't say a word grab her to suitable place and fuck the hell out of her.

  • When the occasion arises that she walks in on an erection, just lay there and smile at her and see what happens.

Most Helpful Girls

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What Girls & Guys Said

0 5
  • Go for it mate

    • yes! MHG

  • looks like her sister wants you in bed

  • Lol i would just avoid her and your girlfriend needs to not ne leaving her sis alone with her boyfriend these things happen

  • watch layla london sis love me and act like you dont know jackshit about it
    smells like sex to me


  • Fuck her with your girl friend