Tamaki is a waitress who works at Cafe Triangle. Ohashi cannot bring himself to confess his feelings for her, so his friend, along with his confidant, Tomoe, get the ball rolling for them.   

1) After the Cafe (after the Cafe) 
2) Triangle Cafe (トライアングルカフェ); Comic Mujin 2003-01 
Waitress Tamaki has sex with her playmate Kurono at the café she works for. Ignorant of their relationship, their common friend, Ohashi, visits the café as usual to see Tamaki whom he secretly loves. However, Kurono notices Ohashi's feelings. In order to incite him into confessing his feelings to her, Kurono molests Tamaki and makes her wait on him as she is. As she was sexually excited, she gives off a female's scent, which, in turn, excites Ohashi. Meanwhile, Tomoe, a friend of Kurono's appears… Will Ohashi be able to confess his love to Tamaki? (Source: AnimeNFO) 
 
3-4) Square Cafe (スクウェアカフェ); Comic Mujin 2004-01, 03 
5) Mirror Shot (ミラーショット); Comic Mujin 2003-06 
6) Saigo no Part (最後のパーツ); Comic Mujin 2003-08 
7) Shounen Grie (少年グリエ); Comic Mujin 2004-06 
8) Sugar Train (シュガートレイン); Comic Mujin 2003-03 
9) Tomijuu: Bubble Houkai (トミジュウ バブル崩壊); Comic Mujin 2003-10

Waitress Tamaki has sex with her playmate Kurono at the caf&eacute; she works for. Ignorant of their relationship, their common friend, Ohashi, visits the caf&eacute; as usual to see Tamaki whom he secretly loves. However, Kurono notices Ohashi's feelings. In order to incite him into confessing his feelings to her, Kurono molests Tamaki and makes her wait on him as she is. As she was sexually excited, she gives off a female's scent, which, in turn, excites Ohashi. Meanwhile, Tomoe, a friend of Kurono's appears... Will Ohashi be able to confess his love to Tamaki? 
(Source: AnimeNfo)