The innocent office girl walked like a duck when r

At work there is a divorced single mom in her mid thirties with a body like Mary and with short blond hair. I see her every day when she goes to the coffee island and I cannot keep my eyes of her.
She is a little shy and only reply with few words when talking to her.
I have noticed that 2-3 times a year after a weekend, she shows up shining all over her face and walk a little "duckish" for a few days thereafter it fades out. During those days she turns red in her face if anyone says something to her!
Since I noticed it first time 3 years ago, I cannot stop fantasizes about what she got.....!

After Easter weekend few months ago, she walked really slow and like a duck to the coffee island. She was on her own, but she had a smile on her face all the time looking down at the carpet. However this time it took a whole week to fade out....., I guess she got cock for an hour, maybe 2 or 3 hours....., my mind is going crazy.......!