 If you liked
Animal X: Aragami no Ichizoku
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 ...then you might like
Sex Pistols
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Both manga have the same premises, but do something different with it.
In both; After a strange occurrence a naive character finds himself drawn into a secret world where a human looking, but animal 'aligned' species evolved along with humanity. But the species has a slight problem - they don't breed well. Fortunately for the aggressive seme the uke happens to be an hybrid who is an ideal breeder...despite their protests of being male.
Animal X has secret government organization, experiments, Yakuza and is in an old style of artwork. Sex Pistols is a school-life with more pretty shoujo artwork.