Strea is a character from the Hollow games and I like her a lot! A scene like this one actually happens in Hollow Fragment, she tries to get a kiss from Kirito and for some reason Asuna jumps in and ... I don't know and it doesn't make sense, it's just SAO fanservice but I don't complain. haha

I prefer many parts of the game universe over the anime version since it spends more time with the characters doing funny stuff together! Strea fits really well into the story and I'm a bit sad about the fact that she isn't present in the anime. :c