These are 2 yaoi series that haven't officialy been completed yet, but totally deserve the read! (You can find any series I post on mangago)
Maou Lover by Kinuta Nana
Plot - “Don’t show that face to anyone else except me” Mao, the demon-king-like genius pro tennis player, and Hikaru, the S (sadist) and intellectual player, are rivals from when they were juniors! It was supposed to be like that but he always looks at me whether it’s during the game or not. Furthermore, suddenly asking me to go out on a date and even French-kiss me…! I can’t stop my heart from beating fast, could this be…love !? This is so freaking cute and funny! The only sad thing is that it only has 1 chapter out, and it doesn't seem like it's gonna update anytime soon. But chapter 1 is just so freaking good, and total recommend to check it out!
Hachimitsu Ouji Wa Shitsuji Ni Madou by Rokujyo Poco
Plot - This is my duty as a butler... Son of the marquis, Nicholas has strawberry-red hair, honey-yellow eyes, and syrupy smooth skin. At his side at all times is Eim, his butler. Though Nicholas has already grown up, Eim still loyally bathes his master. One night, Eim walks in on Nicholas fantasizing about his butler’s true feelings... This is just a cute short story with 2 chapters. It says it's not completed, but the 2 chapters that are already out are just too cute to not read~