Responses
It's because of the fat, I guess.
Oh, the sex scenes were quite awesome, but even if Makoto gained weight, it would show more around his middle section, and not all in his boobs. Find me annoying all you want, but seriously, this is a bit overkill on the boob fat:
http://www.mangago.me/read-manga/free_dj_thicky_cutie/mi/mi_chapter-1/14/
http://www.mangago.me/read-manga/free_dj_thicky_cutie/mi/mi_chapter-1/16/
Makoto has women's boobs during sex....