I like DP's first scenario the wife of a wealthy man in a B-movie sex thriller , but instead...
Picture this:
Maggie Q as a bisexual golddigger trophy wife WRONGLY accused of killing her rich husband; her sexually manipulative antics and additional suspicious behavior throughout does lead the viewer to suspect her almost as much as the cops. She wears short skirts and hose in every scene she's in. Late in the film, she is finally arrested at her husband's funeral in a black dress, black nylons and heels. She's taken to an interview room where a detective played by Kristen Chenowith wearing a dark grey skirt suit with a white blouse, tan hose and dark grey heels is waiting.
Side note: Kristen had the rotten luck of not only drawing this case fresh off her honeymoon BUT ALSO knowing Maggie from college where they...well...experimented.

For most of the film, Maggie, recalling Kristen's secret love of nylons and footjobs, tries to keep her off balance by kicking off her shoes and flashing her pretty feet every time she questions her. This causes tension in her new marriage mostly because the jealousy of her new hubby. Kristen never bothered to tell him about Maggie and only does so after he surprises her at the station and catches Maggie seducing her with a footjob under the table during her first interrogation.]
Realizing she's in really hot water Maggie tries to seduce her old friend with a footjob one last time. She quietly kicks off her pumps and goes to work gliding her feet up and down Kristen's thighs.

She admits marrying her husband for money, but adamantly denies killing him. Wise to Maggie's seduction technique, and now 100% convinced of her guilt, Kristen decides to turn the tables. She quietly removes her shoes and plays footsie back. Kristen's partner, whose seated at table next to her is so preoccupied with showing Maggie evidence that he has no clue what is going on.

With ease, Maggie debunks every shred of evidence against her, while moving one of her feet up to Kristen's crotch.

Kristen briefly fidgets but remains calm and puts her foot in Maggie's crotch before revealing what she thought was the smoking gun: a $50,000 wire transfer from a Cayman Island account to the still-at-large hitman. Maggie pauses for a moment, then places her other foot in Kristen's crotch and calmly explains that no one but her husband's son from his first marriage had access to that account, so she could not have possibly ordered the hit. Hearing this, Kristen cums.

Again, her partner is oblivious.

Maggie puts her shoes back on and politely asks if she could leave. Kristen stammers a "yes" and apologizes. After her partner escorts Maggie out, Kristen gathers herself and calls her lawyer to draw up annulment papers.
After capturing the real killer and the hitman, Kristen resigns from the force, gets the annulment and sails off into the sunset with Maggie.