Onee-san to Chikan Densha - Hazukashii no ni... Aieki ga Tomaranai!

Our heroine hasn’t heard from the man she met in quite some time, but an encounter aboard a crowded train awakens some of the same feelings she had with him. She’s confused by how she can allow herself to feel such pleasure when there are so many people around. Maybe she really is more perverted than she thinks….