Press W to bring up the in-game phone view, navigate to the second icon (heart iirc) then find Ms. Jennings and click on the note icon: there you have a free walkthrough.. IIRC after the handjob you have to get detention?
EDIT: you get detention by talking with Fred during class.
EDIT2: also, if you at the start selected the wrong option then first you have to talk to her each morning untill you see a popup that says that you've seen all the dialogs.
EDIT3: IIRC you also have to check her out as she changes her clothes after the gym (press Q to activate Invisibility)