Bored with the routine in her sex life with her boyfriend, a promiscuous high school girl discovers the concept of NTR while watching a random AV at a love hotel with him. Shocked and aroused by the idea, she comes up with a plan to have sex with her friend right in front of her boyfriend. Unable to hold back, she takes out a condom when her boyfriend steps away, then has unprotected sex with her friend. She desperately tries to muffle her moans, but her sounds quickly shift, revealing her overwhelming pleasure. Her boyfriend notices the change and realizes no condom was used, panicking as he tries to make sense of the situation—only for the friend to cum heavily inside her at that exact moment. The stark contrast between the devastated boyfriend and the triumphant friend becomes the ultimate highlight of this intense NTR encounter.