Natsume-san wa Hokorobitai

Natsume has been able to get rid of his aversion to sex thanks to his relationship with Kou. He rediscovers how cool Kou is and decides to create an agenda again to be worthy of him. Meanwhile, his childhood friend Kurumi returns to Japan and......!?
(Source: Shinshokan, translated)
Note: Includes one extra chapter.