Total Recommendations: 2
If you liked
Seireitsukai no Blade Dance
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...then you might like
Juuou Mujin no Fafnir
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Starts off the same, MC finds a naked girl bathing and is thought to be an intruder. Both male leads are forcefully enrolled and are the only guys attending an all girl academy of magic. MCs are known to posses the same magic (that the girls have) So in general its a Harem involving magic with dense (maybe secretly strong) Male Protagonist in an academy life setting.
If you liked
Kaichou wa Maid-sama!
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...then you might like
Mayo Chiki!
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both contain a male character that finds out their secret both about girls who are working in secrecy so classmates don't find out their true identity