Crowded Commuter Train Mass Groping

The story

Senzo, an elderly man who once made a living by pickpocketing on crowded trains, now lives alone in a spacious house. His biggest worry is that he is no longer able to have sex with women due to his age. So he decides to cure his impotence by listening to erotic stories from Yumi, a young part-time worker. Yumi asks her friend Mika to come up with stories and reads them to Senzo every day. The stories stimulate his lust and gradually Senzo's penis begins to rise, and finally...