I Bumped Into My Ex-Girlfriend!! She Started Perving On Me Right Next To My Girlfriend!

My girlfriend/fiancée and I casually head somewhere, and by chance... my ex-girlfriend is there! Meeting again after so long, the distance between us gradually shrinks through awkward conversation. My ex, out of spite for breaking up, seduces me and acts like a slut! Despite this miraculous situation, the realistic dialogue makes you feel as if you're actually in that scenario.