Dunno, I just chose the options that seemed non-creepy/socially inept like introducing myself normally and not just randomly groping someone I just met.
I remember it seemed pretty obvious which choices would be a bad idea at the time.
EDIT: I made a new save and did everything again with the same results; there are probably other ways to get through it but these are the choices I made:
Introduced myself by saying my name, then when I came back the next time said I like to know who my neighbors are.
After getting all the ingredients said some of them were harder to find than others, then didn't grope her during the soup scene.
After I returned again followed her to see her son is dead, then leave and come back, told her I know about her son and apologized. Said I understand if she wants me to leave, then said "sometimes out nature can be too strong", "what happened", then "so that's why a beautiful woman like you is alone" during the conversation.
At the end of the cunnilingus scene I said "glad I could make you feel better"
Left and came back, said "I've been thinking a lot about you too" then got her sex scene and said "I really enjoyed that".
Then she just chills in her house.