Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: So I (23M) used to sleep with this girl a few years back that I went to uni with and there was no real connection on my end just a bit of drunk fun here and there. I got the feeling at the time she was really into me and I stopped the situation and moved it into a purely platonic relationship. 

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I've been off the scene and living out of the city we're from for a a year or so now and we all caught up for some drink's, being drunk one thing lead to another and her sister and I ended up going home together. Nobody knows because we were quite cunning about it and put 30 minutes between each of us leaving said ex FWB's house (this is what I feel like I'm an asshole for doing). Her sisters cute we got on really well and had a fun night together.

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If this came out it would really hurt my ex FWB/ good friend and I feel like an ass but at the same time I had a great emotional and sexual connection with her sister and don't regret it AITA?

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sleeping with an ex fwb sister