In Evergreen College, after I finished the first stage of quest "Destined Lover" (see Fig.1, had sex with Azusa's mom three times, then they ran away), there is a cut scene that Masuo had sex with the girlfriend of Kunio (Fig.2). After this cut scene, I once accidentally trigger a second cut scene: Masuo is naked sitting on the floor between Azusa and his mom, and Momoko shows up and picks Masuo on her back. This cut scene never happened again later in my attempts. Here's the question, can somebody tell me is this a bug that I triggered a cut scene from other quest stage or how to this cut scene?