18+ Secret Mission: Sennyuu Sousakan wa Zettai ni Makenai!

Undercover agent Riko Ikazuchi and her partner Noma infiltrate an apartment that is also the hideout of a criminal organization. They pretend to be newlyweds. However, when the perpetrators don't hear any sounds coming from them at night, they become suspicious.

To convince the perpetrators that they are a married couple in love, they start touching each other and making noise...

(Source: TMDB)