Ecchi no Susume

Our guy is asked by his sister to find a partner to test her two person virtual H machine. First girl is his neighbor/childhood friend, but a 2nd girl, his sister's boss' daughter joins the fun later. Anyway, this machine connects two person and let them play in one of four scenarios. How far she will go in a scenario will depend on her Love and Willingness, which increase after a successful completion. Well, virtual love is easy, but will he be able to win a girl in the real world?

[From Li's Fun House]