Sex wa Test Play ni Hairimasu ka!?

Harukana is a scenario writer for an adult game production company. When he gets tasked with an urgent assignment to write a scenario he has no experience with, he finds himself stuck. However, when his level-headed illustrator and subordinate Tomoe gallantly shows up, Harukana—desperate for his next big hit—comes up with a drastic idea: ask Tomoe to try it out with him!

(Source: Renta!)