Childhood friends, who started dating in high-school only to be separated for six years, until Mii-chan finally comes to Tokyo to live with Kei-chan. Ch.0-Ch.4 are a prequel, with a sadder and more serious tone. Vol 1 and Vol 2 are pretty much pure fluff, but very good. Both characters are well-developed and their relationship is just precious. Mii-chan has only been the uke so far, but has expressed interest in topping the exclusively seme Kei-chan. They do finally reverse in the raws.
Connected one-shots focusing on the employees of a gay porn company. Ex-Yakuza Sakuma and ex-porn star Kumi have been in a complicated and open relationship for many years. Both top other people in Ch.1 and Ch.2. Ch.3 focuses on Kumi-san's fan/camera man Saiki and porn star Reni, but includes a 3-some with Kumi. Ch.4-Ch.5 explores Kumi's and Sakuma's past, with Sakuma topping in Ch.4, then switching in Ch.5. Personally I didn't really like Kumi/Sakuma and wish there was more of Reni/Saiki.
Rutta is a deliquent who falls in love with his mostly ordinary roommate Kodoma. When Rutta suddenly confesses Kodoma is thrown for a loop, but agrees to go out with him as he sorts out his feelings. Super fluffy, little substance, but that's okay sometimes especially with it's charming characters. Reversing teased throughout, most notably in Ch.6, but alas Uke!Rutta is but a fleeting dream that never comes to fruition.
A classic love story following the relationship between two adult film stars turned top actors, the sensual and cool-headed Iwaki and the younger passionate Kato, over many years. This manga has it all: hot sex, fluff, drama, comedy, romance, and two brilliantly developed characters. Iwaki-san tops Kato the first time, but thereon he's usually the uke, although they occasionally switch as in ch.17, ch.57, ch.64, and ch.87.
Smutty Threesome manga about childhood friends in a love triange with a paper thin plot. But who cares, it's hot as hell. One of the Semes is also a bottom for the other Seme.
Reno attends a private catholic boys school. When he finds out his new roommate, Roje, seemingly a soft-spoken and kind-hearted man, is the infamous "Casanova" who will have sex with anyone who pays him, Reno naturally becomes curious about him. Seme has paid sex in either position. They only have sex once in the expected positions, but the Uke does say he wants to try topping sometime and the Seme doesn't mind.
I don't want to spoil anything, but there's reversing all around here, though not complete reversing unfortunately TT____TT. Ch.5 and Ch.6 have incest, just a heads up.
No explicit penetrative sex in this, but the two main couples are pretty ambiguous about top/bottom.
This isn't my thing at all so I'm not going to bother reading it, but I'm pretty sure there's something in it that would qualify.
Lots of reversing, but the story is seriously fucked up, with incest and cheating.
Itoshi no Nekokke