It's almost lunch time? Like that's any excuse to not have sex! As she suggests, just, you know, have sex before lunch.
That ending though. Well...If you don't want it affecting her studies, then just use the good old 'reward' method! Offer sex as a reward and she'll definitely do her best for studying and do well in any tests if there are any upcoming.
And don’t forget to praise the Goddess of Sequels \o/