Just Watching My Girlfriend with a Stranger Pt.1

Emi, whose boyfriend suffers from ED, remains unsatisfied even after having sex with him. She desperately wants to drown in passionate sex with him every day! To help him, Emi strips naked in front of her boyfriend and releases her pent-up sexual desire with another man. But what will happen to her relationship with her perverted boyfriend, who gets aroused watching her get tied up and taken by a stranger?!