Circle is Clio (Mizuki Takami). Published 1997.
Quatre accidentally drinks one of Duo's science experiments. He becomes flushed and seeks solace from Heero. Heero sometimes embraces him and sometimes pushes him away. Looks like the experiment created a Quatre clone, both who love Heero (and themselves, yes you see Quatre kissing himself). Very bizarre, but cute.
Circle is Two Unit. Published 1997.
Angst-filled shounen-ai. Trowa is in love with Wufei everyone seems to know this except Wufei. Wufei is confused by his feelings for Treize (and possibly Trowa). Time passes and Trowa is now an officer in OZ. Wufei gets captured and sees Trowa in uniform. Trowa says something snide about L5 and Wufei slaps him. Trowa looks crushed. It certainly has that "to be continued" feel to it, but I'm not sure.
Circle is Momoman Club (Hitomi Kurisu & Seino Misaki). Published 1995.
Trowa in his OZ uniform comes to visit prisoner Heero for some (CUE: cheesy porn music) entertainment. It's lovely yaoi. Then the rest of the book is text. I like the way both boys are drawn here.
Circle is Momoman Club (Hitomi Kurisu & Seino Misaki). Published 1996.
Trowa is aboard the Peacemillion suffering from amnesia. Heero is watching him from afar. Quatre tries to get Heero to talk to Trowa, but he refuses.
Trowa finds Heero in a hallway and mentions that he's spoken to Quatre. Heero grabs him and kisses him rather forcefully. Trowa returns the kiss. Heero tries to fight tears as he turns away from Trowa and leaves. Oh angst.
Then again this is followed by a lengthy text novel.
Circle is Magnum 55. Published 1995.
Despite the rather hentai looking cover, most of this 84 page doujinshi is gag humor. It's not until later that you get a yaoi story of Duo and Quatre. This story seems to be about Quatre either remembering a past life as a maid in the mansion he and Duo are in (or it's possibly just a dream he keeps having). Duo makes fun of him for the most part. In any case, they opt for getting up close and personal instead.
There's also a short shonen-ai story of Duo and Quatre in the desert after Heero self destructed. Duo's upset and Quatre comforts him. Very odd book with some very nice pictures in it.
Circle is Marou. Published 1997.
A few short gags until you get to the main story which seems to be Wufei thinking back on his childhood on L-5 (I'm guessing L-5 has blown up at this point). Trowa visits him and gives him a hug and tries to kiss him, which upsets Wufei. Wufei goes to talk about this with Heero and spies Heero and Duo snogging.
Wufei runs off to his room. Trowa comes to his room and kisses him and let the yaoi times begin (tasteful yaoi). Not bad I guess.