“Oppai Momitai” tte Sakendara, Imouto no Tomodachi to Tsukiau Koto ni Narimashita.

"I want to rub some boobs--------~~~!"
"If I let you rub my boobs, will you go out with me...?"
An ordinary high school boy, Natsuhiko Umboi, now has his first girlfriend. It's a love story about an ideal couple dedicated to all who love boobs!
(Source: ComicWalker, translated)