Sakurai Haruka, Nyotaika Shichaimashita.

"I didn't know it'd feel so good to have tits and a pussy...!" Transformed into a woman and discovered by one of his least liked friends, a high-school student's hyper-sensitive female body is taken for wild ride...!!
(Source: Coolmic)
Note: Originally serialized as a web manga under the title Onna no Karada de Iki Sugite Yabai! (女の体でイキすぎてヤバイっ！) with each chapter split into 2-3 ‘episodes’, resulting in a total of 60 episodes.