I mean he had long ass legs.
Maybe you are thinking of the colloquial term for Pholcidae or "cellar spiders", but the manga is referring to the book of the same name, by American author Jean Webster, published in 1912. Wherein, an older, wealthy gentleman becomes the patron of a young girl, providing for her throughout her youth. When she becomes an adult, they meet and fall in love. This is a very popular novel in Japan and many shoujo and shounen ai/yaoi mangaka use it as a theme for their stories. The wealthy gentleman who hired the paperboy was providing for him generously through his employment. They both then fall in love. In this way, the original "Daddy Long Legs" is mirrored. Though, the original is lacking the erotic scenes and masturbation. LOL
This manga made me shake my head. There was sex in public places - people just walked by a moment before and you chose to have sex right there? No preparation before inserting and the ukes love it. You met 30 seconds earlier and then you have sex. The 4th story was called something about Daddy Long Legs - but it had absolutely nothing to do with a Daddy Long Legs. ( ̄∇ ̄")