hey /soc/ I'm in a bit of a dilemma and was wondering if

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hey /soc/ I'm in a bit of a dilemma and was wondering if I could get some advice.

Recently my sister had a guy over and told me before he got there in a text while I was at work asking if I could stay out of the house for an hour or two and that if I couldn't it would be okay.

That's the first weird part, that she was going to have a "friend" over and that it would be alright if I was home.

The next weird part (after skipping the hour or so of sex where she was screaming from pleasure and the weird night of restlessness/diamond dick) was today where after taking a shower she talked to me for a bit while only wearing a towel wrapped around her, which she has never ever done.
So now I'm stuck in a situation where I don't know how to feel and/or how to react to all this and would love some help.

>TL;DR sister is giving off some weird vibes and muh dick is diamonds.