I'm looking for mm book about identical twins title and author

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looking for name author etc identical twins book .
Cass manning is a monogamist grad student and a identical twin to Paul,a drug addicted prostitute, fleeing from a unfaithful boyfriend cass returns to Houston after years away only to be drawn into danger before ,he's out of the airport.
When Paul dies und suspicious circumstances, cass must rely on one of Paul's clients,Kilo is a mercenary willing to protect cass in exchange for sex

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GEMINI by Clancy Nacht and Thursday Euclid.