I'm always so very happy to see more monster girl releases! And it's a succubus in this one!
Come now, my friend! Exams? Clearly not the priority, at least, not as much as enjoying the company of two lovely succubi!
Great ending though. So...She's decided to just hang out with this guy from now on rather than go home and get nagged by her mother? Nice.
Also, nothing wrong with taking extended...breaks in between study sessions.
In all likelihood, the screenshot of male protag-kun's PC (page 6) might suggest the primary reason why he's currently a second-year 'ronin' (know-what-I-mean, know-what-I-mean). Then again, perhaps releasing all that backed-up sexual tension might just be what he needs to relax and pass his exams this time around.
Plus it looks like Kayo and Kurea aren't so much out to drain him dry; only enough to collect essence but leave him alive and able to wield his "magic stick".