u/ResidentAd5390

Your son's GF is over for the day and you happen to find a doll that looks just like her in his bag... and she feels everywhere you touch on it assuming it's her bf

or
My bestfriend and me went to a party and I got super drunk. She asked you her bf to drive me home....

or

My Bf and I goto a halloween party and he's in a costume with a mask. As we wander around and drink I end up running into you thinking you're my boyfriend since you're in the same costume. Who are you and what'd you do to me?
Or

Its bring your significant other to work day and my bf got knocked out doing a traffic stop and his police cruiser got stolen with me still in it

or

I’m your sons girlfriend and go to get a massage on Valentine’s Day and you’re my masseuse

or

any other forced scenario/ref
Let me know what ref/scenario you want.