Might meet your reqs: Seeds of Destiny
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Little to nothing in the way of actual breeding sex, but a lot of preggo bellies.
Novice adventurer stumbles into being the champion of a fertility goddess, teams up with a catgirl wizard and a horny guardswoman, repeatedly becoming impregnated with magical energy which they distribute around the land (magically impregnating pretty much every woman they meet) in the course of their quest to defeat the demon king.
I liked it enough that, after paying $0 for it and finishing all the content so far (pay-what-you-want), I actually went back and paid money for it.
