A strange mix of sketchy and wholesome. It might have been easier to sympathise with the need for secrecy if we had a deeper insight in the relationship between mother and daughter. Because the age gap between 2nd year high schooler and 2nd year university student isn't very big (about 3 years?) and they really aren't trying to hide their relationship from anybody aside from FL's parent this doesn't seem quite as morally dubious as it could have.
Translation is very novice
Zenbu oshiete, sensei