 If you liked
High School DxD
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 ...then you might like
Madan no Ou to Vanadis
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Whilst you could argue that Madan no Ou to Vanadis shares themes with many other harem shows, what it has in common with High School DxD is that they both feature a dominating female lead who has no qualms in making the main character their prisoner/servant.
This show has a similar vibe to that of High School DxD as there is one main guy who fights alongside a bunch of powerful women with romantic and harem intents behind the show. Madan focuses more on the action whereas DxD gives more fan service and humor.
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Recommended by GraniteFlight
Though different in setting the two animes share a similar theme. Both are about two boys who have amazing powers and a personal harem. The two stories both involve magic and two very open main female antagonists. Both animes also feature mystical creatures like dragons. If you enjoy a practical romcom with some action, and fantasy thrown in I highly recommend both these animes.