Let's Play Pretend M by smexplicit

Jaejoong, who has always had a crush on Yunho, hatches a plan. Yunho agrees to pretend to date Jae in an effort to stop the rumors that his current girlfriend is in a relationship to save her movie promotions. What he doesn't count on, is actually falling in love with the fiery songwriter.

Payback & Sweet Revenge M by DevilsNeverCry13

After Jae left DBSK he finds himself constantly frustrated by the abscense of his lover, who was too afraid of getting caught to visit him and take care of his needs. So he hatches a plan to force Yunho to come to him, and gets ready for a wild and rough night.

Twisted M by CryingMochi

Ok, this is a psychological and darker fic then the other  two. Jae's mind is lost and Yunho is left caring for his broken husband and their child. (Yes, it's also a mpreg which I normally don't like, but it was well done and not a main focus of the story.) The story flashes back to how their relationship started and how Jae became so mentally broken and why Yunho refuses to let him go and put him in a home. I won't ruin the ending, but it's more of a happier ending.