My Ex-Boyfriend Is My Bodyguard

Since dating Miharu in high school, Rikuya Nishiki has been dependent on certain... pleasures. Deeply ashamed, he swears to become a strong, manly man, and gets a job as a bodyguard at a security company. But, part of him can't forget all the dirty things his younger ex-boyfriend taught his body to enjoy. One day, who should turn up but Miharu himself, now a successful novelist, demanding that Rikuya be his bodyguard...! All those suppressed longings and obsessions come rushing back as Miharu casually puts the moves on him, just like old times!

(Source: Renta!)