The young man fucked his married colleague, but her husband was weak

I always have sex at fixed times. My usual routine is to come home and have sex with my husband at 10pm, but today I work part-time and it's already past 10pm. If it's a place no one can see, it's okay … I was alone, but Aida-kun, a new part-time employee, saw me. But … I couldn't stop masturbating mid-sentence.