So, We’re Meeting Again, Right? (слэш)

Hermione and Ron get Harry to sign up for a new magical matchmaking service. The service is supposed to take out all the guesswork and match you with your perfect blind date. If that is so, why does he see Severus Snape when he goes to meet his date at a cafe?
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“Well, this is alarming,” Harry said, attempting to lighten the mood.
“Indeed. Tea, Potter?” Snape replied, his tone laced with irony.