You get early access to natasha (you need money she borrows, but she cant pay it back...), julia (have a bottle wine with you when doing homework and eating dinner, talk about sex), anushka (she calls herself a free spirit, but she is a free for all slut, if you dont mind her fucking every guy she sees and trying to invite you to threesomes and more, go for her), pauline (drink with her on the weekly dance for a romantic date in the toilets), lariska (you need to beat/disgrace christina to go further with her), katja (the only loyal one if you say you dont like guys, otherwise she turns into nush2), your sister (after you let her guy fuck you, i prefer to cheat-skip this questchain and just take the goal every night ^^), your magic trainers (at least if you are succubus, dunno about the plain magic route), the girl that wants you to be the maid in her family house (meet her in the fitnessclub showers in the city and seduce her, you dont need to take the job to have fun with her daily), mira (sadly only after you make her the townwhore, this questline really needs a change/lesbian option for the wishes
Nutluck ), the girl working in the beauty salon and the woman checking you out in one of the mall shops can both become your sexslaves if you do it right and the random girls asking you out can be your booty calls if you accept.
There are more, but this are the ones you can find fast or in school.