Well, helping out your drunk neighbour and letting her in as well as listen to her problems out of kindness...What a nice guy.
Also, it just so happens she's a popular idol and also she's quite...thankful. So you see, being a nice guy and also not taking advantage of her while she was vulnerable certainly paid off.
Great ending though! Role playing with a script certainly sounds interesting.
Somehow I always associate idol stories with mind break or gang bang, so seeing one without either is as rare as taking your drunk neighbor home so that she can sober up, realizing that she is an idol, having sex with and ending up in a relationship with her...