I'm not sure I understand this topic even in the slightest.
Auzman, are you like, twelve? I mean, firstly, why would any of us care about your sister's love life. Regardless of whether or not she chose to do so whilst you were there.
Furthermore, while maybe it isn't "considerate" to do such actions whilst your brother is around, we also have to remember he said they were all intoxicated at the time. She probably wasn't even thinking about him being there when she went to do it.
Not to mention it probably didn't last for even an hour, so it's not like she was leaving you stranded in a place you were unfamiliar with or even leaving you for a large amount of time.
What this all sums up to, to me anyway, is that you're butthurt for some reason because you either A) are too young to understand that love is a normal thing that people old enough to have their own places can do or B) this is really all some sort of loveist ploy by yourself because you think it's 'dirty." I wonder even had this been an older brother if you'd have even made a topic to begin with.
