You get Yandere when she first goes to sleep. During the week you can choose to have sex with her while shes sleeping. When the mc questions the decision choose the violently shaking option "she looks so sexy" (or something like that). And i wanna say she needs max happiness too
every day once you unlock head pats do it till it feels out the bar. You can tap the screen or click to make it feel up faster if you don't wanna wait everyday