Ui wants Hayato to be more affectionate with her...and she'll do anything to get what she wants! But when he isn't responsive enough, she takes matters into her own hands...
Right around when you presumably 
started getting into it.
Etwa seitdem du dieses Spiel
angefangen hast.
Más o menos cuando empezaste.
Más o menos cuando empezaste.
Depuis le moment
où tu t’es excitée.
Direi più o meno
da quando le cose si sono fatte interessanti.
Desde o momento em que
 começou a ficar interessante.