 If you liked
Peter Grill to Kenja no Jikan
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 ...then you might like
Dokyuu Hentai HxEros
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Both animes have ecchi as their central theme. Dokyuu HxEros uses libido as a source of power to defeat monsters that suck people's sexual will. Peter Grill is the funniest, where the "strongest" man in the kingdom goes through sexual adventures, where the girls are maddened to have a strong heir.