MIL[51F] teases me [34M] over facetime

Hi everyone, MIL called my wife over FaceTime and noticed I was in the background. She was showing my wife something and I asked to see too and she goes "uhhh no, nope, no I'm not gonna show you". It seemed like a flirty/teasing kind of thing. Idk why it made me even more attracted to her.

Sorry it wasn't her teasing her body over facetime if that's what you assumed from the title lol.

Is this something or is it just normal behavior. She doesn't do this to her other SIL where she jokes around or playfully teases him. I have caught her staring at my dick print whenever we visit just because it's out there and notice her behavior change a little. Haven't seen her in-person in over 6 months, might visit her in the next 3-4 months so I'll need some tips. We are Muslim so there's that, no excuse of being drunk and blaming that.