Ai no Serifu wa Irimasen

Popular actor Subaru Yuuki meets up-and-coming model Kudo Kaiho at a gay bar, and the two flirt and have a one-night stand. When Subaru's co-star is injured and forced to step down from the drama they're shooting, who should arrive to replace him but Kudo! Despite their recent fling and the obvious chemistry between them, Subaru must resist Kudo's advances because it's his personal policy not to get involved with cast members. Besides, he's not interested in a real relationship; he prefers to keep things no strings attached. Kudo, however, remains undeterred and makes a suggestion: what if, after the show is over, they become lovers?

(Source: Shu-cream, translated)