I walked in on my sister and her boyfriend?

Anonymous
I don’t know what to do. I’m so fucking angry I can’t even explain it. I just walked in and I saw her boyfriend laying in her bed and she was under the covers doing god knows what. (I’m guessing she was under the covers because she doesn’t have a lock so could just hide if anyone walked in) but they didn’t know I’d walked in and all I saw was him mouth “fuck” and widen his eyes and he had a massive grin on his face and his toes were curling and he looked under the covers just grinning and I’ve never wanted to kill a man so much than in that moment. How fucking dare he! I obviously left straight away and then I heard my LITTLE sister giggle and say “your so big baby” and then he giggled and then they said some other things but I just got away as fast as I could. I literally feel sick since I’ve heard her say that. I wanted to go in there and grab his grinning smug little face and shove it down the toilet. Im so fucking angry, what should I do about it?
I walked in on my sister and her boyfriend?
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