Otouto-kun wa Hageshiku Amai

Synopsis

"Can't do without me now?" Tachika has been sleeping with her friend's younger brother, the traveling backpacker Mitsuki. Whenever he comes back to Japan, he stays with Tachika. He is good in bed and they have great chemistry together! But he doesn't have a regular job, and he's her friend's brother... She thought she could keep her distance from him, but she finds herself getting more and more into him instead...?　This is a love story about a dreamy puppy-dog boyfriend, in an age-gap romance between a "friend's younger (25) brother" and a "convenient office lady (32)"! (Source: Muteki Renai S*Girl, translated)