Women at work / The Guts!

The protagonist of the hentai is dumped by his girlfriend, motivating this by the fact that the guy turned out too skinny. Well, our hero now understood what women need and went to work at a construction site to bulk up. However, he has no idea what awaits him at what seems like an ordinary construction site. Not a day without sex, all the girls at the site act as if they've never seen men before...