I would love to vaginally pleasure Eryka, Sariel, Frostpupper, and probably Evelyn (maybe she does, I don't have a high relationship yet). I know Valencia and Lyla also allow it, but getting those are real efforts (nine hour marathon or hanging out drunk and making the right choices) rather than a dedicated option.
I know Sariel is an anal queen and generally has no reaction, but her pussy does get sensitive while she's being plugged in the back, from numerous scene descriptions. Maybe a multicock Champ could start her out 'right' and then take her princess pussy in a sexy way, I guess it could be done if you had the buttplug or dildo toy from Svern as well.
Anyway, those would all require writers, and I don't expect anyone to write scenes (I could probably do the Frost Pupper one, I suppose, maybe Valencia, I know those authors are currently inactive). I am only sharing what scenes I do like and what I'd like to see. Not what I expect anyone to do.