Sami is unique in that, by the end of the game, you will be able to sleep with her at C0... she just needs the right motivation.
That again is why I like Sami. Ignore her and she will be a bitch, show her a little love and it makes her melt. Another feature that would be interesting is seeing the main character become self-aware after the initial loop/introduction to the loop but not anything too huge maybe just before you get any text messages at the start of a loop have the main character say, "and next I'll get a message from x" then have Sami look at him saying "What did you say?" the main character says, "Oh uh nothing." and she goes back to her phone saying "Dork".