I don't have a save for you but nearing the end of Day 13, after you finish talking to Melissa and David at the Paradise Club, you have to be drunk/high enough for the scene to trigger. Either have a few shots or buy some drugs and use them if the opportunity presents itself to you while or after your conversation with them. Then, all you have to do is say and offer her the right things and she'll agree to go home with you. Just know that one particular person at the club will see you leaving with her and when you're confronted with it the day after, it'll be pretty embarrassing. I don't wanna spoil anything, you'll understand after you play through the whole thing.