Sara's words to Alex indicate that they had engaged in that kind of misbehavior- thankfully if so, behind closed doors, very thankfully at that... and also, since they slept together without even fully knowing oneanother's name... that's simply pathetic of them.
This is a predicatable story based on her words, and perhaps Kara thought that was what happened between them.
Super hot, loved it. Personally I would have liked a little more dirty talk, and I also wish it was longer, especially since Alex got to return the favour, but it's got my favourite fetish, lesbian strap-on anal, with two of my favourite characters, Alex Danvers and especially Sara Lance, so I'm very grateful for it.
I hope you do a sequel where Alex gets revenge on Sara, and is able to get a good memory of it this time. Or just another fic like this with these characters.
Finally someone wrote this. Ever since I heard that line from last year's crossover I have been waiting for a fic like this. Great job. Not enough fics with Alex on the receiving end.