Saikyou no Furyou ga Nyotai-ka! Tsundere Ore Kuchou no Bishoujo ni!?

Subaru was the hardest of a gang of thugs, directly descended from martial artists.
How does a guy this tough end up cursed as a big-breasted woman!
Feminized Subaru has to fend off perverts and find a way to return to normal.
Meanwhile "her" body is subjected to nonstop erotic happenings.

(Source: dlsite)