1) High School ☆ Lullaby [Gesu BL]. - The Uke suddenly ties the asleep Seme & raped him http://www.mangago.me/read-manga/high_school_lullaby/
2) Shoujo C [Joshi BL] - Their gal classmate sees them & Koizumi's true indentity http://www.mangago.me/read-manga/shoujo_c/
3) Requirements for Being Trash [Kuzu BL] - Back story of Koizumi since he was a child. http://www.mangago.me/read-manga/kuzu/nbt/tr_chapter-3/pg-1/
4) Don't Take Off Your Gym Uniform - Their changed relationship after they had sex. http://www.mangago.me/read-manga/gakuen_tengoku_sore_wa_koi_desu_koizumi_kun/nmt/c001/1/
5) Lonesome Neon Tetra - W/o realizing Kashihara’s jealous! Meanwhile Koizume thinks about making their feeling mutual. http://www.mangago.me/read-manga/gakuen_tengoku_sore_wa_koi_desu_koizumi_kun/nmt/c002/1/
Reading order: 1 Kuzu - ch3 2 High School Lullaby - The Uke suddenly ties the asleep Seme & raped him 3 Shoujo C - The gal sees them. 4 Taisoufuku O Nugasanaide - Their relationship after they had sex. 5 Gakuen Tengoku - Sore Wa Koi Desu Koizumi-kun No sex, just a HJ that was nearly a BJ before seme cut it off. Ending also cut off and left me unfulfilled. Waiting for the uke to stop doing all the chasing and the seme to just give in already.