Tamara again. I'm having troubles with recruiting her starting from last version (27.01).
Okay, to get the Flirt option, Billy needs to have Fa 40, and Tamara needs to not be suspicious. Once Billy succeeds at a flirt check (which is based on Social, Personality, and number of Tamara tutoring sessions), the check to get Tamara to invite Billy out is:
if tam.love>=25 and weekday == "Monday" and story1.tamara_afterschool_event == 0 and (story1.tamara_freddy_distraction == "Rejected" or story1.tamara_completed_step >= 1):
So, Lo 25, it must be a Monday, she must not have already invited Billy, and either Billy has rejected hooking Fred up with Mom or Sis or the first investigation is complete.
(On a side note, you might want to tutor Tamara at least 10 times if you want to recruit Derek without hooking him up with one of the girls.)
When you meet with the guys in the library the first time, Derek asks: "so mrs Larson wants you to narc us..." and here are two possible answers: 1) preety much 2) no she wants to look good for the school board.
Does the answer you choose affect the game development in any way or does it have any visible effect?
Yes, although there is not necessarily a correct answer. 1) is considered to be truthful, and 2) is considered to be a lie in the game code. If Billy tells the truth, Favor will increase with Tamara faster during tutoring. If he lies, tutoring Derek will not cap out at Fa 30.
At this time, the only real reason to increase Favor with Derek is if you want to pick him (instead of Tamara or Fred) for storyline events. I have not delved much into the storyline, so I do not know offhand if it is ever advantageous to pick him. (Additional note, Billy only needs Fa 20 to be able to pick Derek.)