Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/Effective-Answer-20 on 2023-06-26 19:06:42+00:00.

I (23F) live in an apartment with my fiance (24m) and our 4yo. I have always had a good relationship with my sister (16F). Ever since I moved out of my parents' house at 18, she has always just been allowed to come over to hang out whenever she wants.

On Thursday, my lil sis just stops by to hang out per usual. We spent about 20 minutes catching up, just chatting about our lives.

After that, my sis noticed that my fiance had one of the new playstation games that is part of a franchise she is really into. So her and my fiance got the game going and started both playing it on multiplayer.

So they were playing video games together and it came time to pick my daughter up from summer school. I got back to the apartment with my daughter and they were still playing the game.

My sister stayed over for a little longer. She helped me cook dinner and ate with us before going home.

After she went home, my fiance said he needed to talk to me. He said he felt awkward saying anything when my sister was there but she was flirting with him while i was picking up our daughter. She said that it was "hot" how good he was at the game. She also made a comment that she wishes that he wasn't my fiance so she could kiss him.

My fiance said that the situation just made him very uncomfortable so he just sat there silently ignoring her comments.

I called my sister confronting her about it. She said that my fiance was ok with the flirting since he didn't do anything to try and stop it. I told her that her comments were very inappropriate and that she can't come over until she apologizes to my fiance for making him uncomfortable.

She did end up apologizing to me for disrespecting my relationship. But I feel like my fiance needs a direct apology since he was the one who had creepy comments directed at him. My sister says she feels too weird to apologize to my fiance directly.

I feel like I'm the asshole because I'm risking my whole relationship with my sister over something she has already apologized for. Is it too much asking for her to apologize to him as well?