She Smiles At You Awkwardly
When you finish and grin at her expectantly, rather than congratulating you on a job well done, she stares back for a second, seemingly confused by your excitement. In fact, she looks as though she doesn’t understand why you’re so pleased with herself.
She may force a smile as she remembers her stellar performance from minutes before, but it's only to maintain your delusions of granduer. You're under the impression that you're the man right now, and she looks like she's constipated rather than basking in her post-orgasm bliss, you should wonder why.