Claire did a bit of that in "The Trap" (postmortem, and the blonde unfortunately was wearing a bra) and I seem to recall she might have done so with Danica in a White Angel, but I may be mistaken. I loved it in Ultrawoman 1 as Lynda died topless (I do wish she'd go back to doing topless!), and then again when Samantha Wilde groped her while she was knocked out in Ultrawoman 12! It's always a hot element, but something many of the actresses aren't comfortable with, apparently.
Have you enjoyed DarkBat 1? I hate the blue filter, but it is unique for featuring the only double orgasm death Bluestone has presented to date. Jenny orgasms as she dies, and then Christina as the gatekeeper orgasms right after! I'd really love to see that kind of outcome from one of the versions of the Sienna v. Yvonne matchup... probably with Sienna dying and Yvonne doing the killing. Graveyard Shift suggests that Sienna may be hovering at the edge of full nudity, so it would be really great if she were killed in sheer pantyhose with no panty underneath!

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Lynda was incredible in the first Ultrawoman. Those were also her days of doing softcore and girl-girl movies (under a different name). Much like Yvonne, I think that's why she was so comfortable to give a very sensual performance in Ultrawoman 1. Too bad the squirting effect wasn't available when it came out.
I think it would be very hot to have Sienna ultimately lose at Yvonne's hands. If Sienna and Yvonne gave a full-blown performance that showed lust, with lots of back arches, I think it would work beautifully. Sienna was great in
The Curious Detective and other movies. Having another WA movie with plenty of sensuality and sex appeal would be a fresh approach. So rather than the Angels pleading "No, no, you can't! This cannot be!" (which we've seen plenty of), it would be much hotter if the babes flirted with each other and, yes, even the idea of their own demise. For example:
SIENNA: (Seductively) I thought I was the only busty blonde agent in this organization.
YVONNE: (Just as seductive) Why don't you come over here? I'll solve our mutual problem, and be the only busty blonde left.
SIENNA: (Moaning and kneading her breasts) I'd love to see you try.
They fight, but every time one lands a powerful blow on the other, they both can't help being turned on. They could even tease each other by revealing their own breasts themselves, rather than the usual scenario of villain ripping reluctant heroine's shirt.
Later, while Yvonne is strangling Sienna, she pauses for a moment.
SIENNA: (Lustfully pleading) Don't stop!
YVONNE: (Licking her neck) You're too slutty to be an agent.
SIENNA: Make me cum. Finish me off! Yes!
The "Don't stop line" was something someone suggested a long time ago, but I haven't forgotten it since. I think a different spin, like this, would be something new, although it would harken back to movies like
WA19,
The Assassination Agenda, and even
Darkbat 1 (which I also enjoyed). If the movie is well shot and acted, it's guaranteed to sell well, especially if it's significantly advertised on other forums.