These are 2 series I really like and aren't aswell known with just unique plots. (You can find any series I post on mangago)
Akuma De Keiyaku by Himuro Sakura
Plot - Ryou Jinnou is the chairman of a big company. Having succeeded his late father very young, he’s bored to death... And he chooses as a hobby the summoning of a demon with which he decides to have fun, whether the demon likes it or not! Ryou and Belial thus form a contract, which states Belial has to grant Ryou three wishes, whatever they may be. Demons are just one of the best things in yaoi stories for me! This story just made me laugh because of the weird semes~ It's a fun, short story with 2 good stories in it!
Feng Yu Jiu Tian by Feng Nong and Wang Yi
Plot - Feng Ming was only 19 when he lost his life saving a child from death without hesitation. The grateful father of the rescued child grants Feng Ming a second chance at life. Unknown to Feng Ming, his soul is whisked away to a far away ancient land (resembling the dynasties of China).Upon waking up, he finds himself inhabiting the frail body of Thunder Kingdom's crowned prince who is also graced with the title of the most beautiful man across all the lands. However, his beauty has a price as he attracts the unwanted attention of the minister of affairs, Ren Ting who finds every reason to torment the prince mentally and physically. As Feng Ming starts to get a hold of the conspiracies surrounding him, what will happen when the prince's true identity is revealed? And what happened to the 'real' prince? This technically is a manhua, but idc~ This is seriously one of the best yaoi manga's I've ever read in my ENTIRE life. The sad thing just is that it never gets updated and the only way to read the rest is by buying the online book version, but I just read the real yaoi novel~ But the manga chapters I did read were SO good, the art is great, the plot is beautiful and historical, and since I'm a big history fan this was just great to read. It's the perfect mix - Great art, unique story that's fascinating, yaoi ofcourse and also unique character personalities! Great read, and even if it's just a few chapters, I would definetely recommend checking it out! and ofcourse it's comedic aswell~