ERDM-100 - Extreme tension! Will it be discovered or not!? Her best friend and reverse NTR mental breakdown! Sex while holding back moans! 4 hours

She said she was bringing her best friend, so I was pretending to be a good boyfriend, but that girl was really my type! We were hanging out as three for a while, and she fell asleep, and it became a good mood between that girl and me. I didn't want to get scolded by her, nor did I want to cause trouble... I was agonizingly worried when she said, 'If you absolutely keep it a secret, you can do it.' Huh!? Is that okay? Having a sexual act without making a sound next to her sleeping...