Miss Regular Customer Wants to Enjoy is a Manga/Manhwa/Manhua in english language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Izumi, a university student part-timing at a manga cafe, got curious about a regular customer. Her name is Honami, a high school girl who's been coming to the manga cafe recently. This defenseless and seemingly cute girl who he can't take his eyes off of has a secret...!? This is a slightly naughty, heartful love comedy where this gentle pair will get to "enjoy" their youth to the fullest!!