[Tamachi Yuki] Hatsujou KIDS Cool Bomb 1 & 2

Jun's summer romance comes with a catch—his girlfriend is his best friend's little sister, four years younger and far bolder than her nervous schoolboy boyfriend can handle. With her brother out of the house and the sweltering heat making excuses for them, Tsugumi drags Jun into her brother's own room, where she climbs on top and rides him until they're both drenched and gasping, giggling about how the open window might give them away. Between sneaky trysts, a sweaty confrontation between best friends over who claimed whose sister, and Tsugumi's merciless teasing of Jun's inexperience, this two-part romp keeps the comedy every bit as hot as the action.