User blog comment:Zepekinio25/Monster Girl Quest : Servant of the monster lord/@comment-28066787-20160702095543/@comment-31081547-20160702135003

They do, in the hentai version i stopped building. I however don't remember what i actually made them do on the non hentai version...You mark a point i'm going to look a bit better at this.

But in the end it's pretty close to emptying him of his vital energy, less the hentai.