At Attention: Out of Uniform, Book 2 by Annabeth Albert
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Summary
Lieutenant Apollo Floros can ace tactical training missions, but being a single dad to his twin daughters is more than he can handle. He needs live-in help, and he's lucky a friend's younger brother needs a place to stay. He's surprised to see Dylan all grown up with a college degree...and a college athlete's body. Apollo's widowed heart may still be broken, but Dylan has his blood heating up.