Please Tell Me, Teacher

Rikako asked her tutor, Tomoya, "If I get a perfect score on the next test, would you kiss me as a reward?" "If you get 100 points on your review test, I will kiss you wherever you like." He kissed her on her forehead, cheek, and.... Rikako became more and more greedy for his kisses until she couldn't hold back anymore and confessed love to her teacher. She got an unexpected reply, "I like you too!" "We're going to do things that aren't just for rewards. I'll teach you everything I know." Rikako was confused by this unexpected reply, but...? (Source: Love Jossie, translated)