I'm not a fan of fat bastards, but the premise is wack and fast paced it got me laughing with a boner at the start.
The energy portrayed with the intercourse part is top-notch though and the scene felt a bit short with the imouto at the end.
Honestly I appreciate how the MC plays it slow in their relationship even as friends, being quite aware of his position and her situation in the school. A bit realistic on how the romance progress on this manga.
Not that I experienced romance first-hand. I was always a bystander.:haa: