Spamalot's manga / #kink(1)

This is really cute ꧁༺ 9 chapters + extra ༻꧂ Summary Shougetsu, the top student in school discovered anal masturbation and started trying it out of curiosity but because he doesn't have privacy at home with his 2 young siblings, he tried doing it in an empty classroom and got busted by Yuki, the popular #2 in school. Yuki proposed to help him if Shougetsu will help Yuki study