Wait, I found it, Chapter 17.2 of Eiyuu No Musume To Shite Umarekawatta Eiyuu Wa Futatabi Eiyuu O Mezasu.
I agree with all of this except the sitting on their ass part for 8 years. The typical MC goes from zero to grandmaster in a fraction of the time that the antagonistic divine heavenly saint he just wiped his ass with yesterday. Well I guess there will be a few set backs among the 100,000 or so chapters of beating up young masters, killing their families(in self defense ofcorse), and courting(raping) the Jade-like white skin Beauties whome the MC saved earlier from the now dead or severely injured young master.
Your definition of self defense here (and in every one of this novels) is a bit... broad to say the least. Heck even the best ones in that are more like "It's not rape, mc is just helping the beauty relieve the symptoms of the magical aphrodisiac or something while she is almost unconscious" or something equally bullshit.
Gotta love how many feminine issues these utter assclowns think shoving a dick in it will solve. Makes me truely wish they had a stronger feminine authority in their lives... on second thought i doubt that would work. They would just gravitate twords another fetish