I owed Iznogoud (a great “hentai finder” sending me links to rare translated hentai stuff), if I found one, a long enough english-translated incest hentai manga, preferably with “shota” style : here it is

Hitozuma Lovers is the story of cute & young Aki, who screws big-titted housewives as a substitute for his mother fetish, until, who knows, he could have the courage to try to do her…
That’s a very fast summary, but I didn’t like the story a lot myself, so take a look for youselves for more