Dangerous Drugs of Sex (2020)

After attempting to commit suicide, elite office worker Katsuragi Makoto wakes up bound in an unfamiliar place. There he meets his captor, Yoda Ryoji, who forces a horrible life of sexual assault and confinement training on Makoto. The two start bonding and each begins to recall the tragic past that led them to this deranged situation.

(Source: MyDramaList)

~~ Adapted from the manga with the same title by Mizuta Yuki.