This is a bonus episode of the BD release of Bikini Warriors. As such, it is rather... different than the normal episodes.
Bikini Warriors is normally made up of two things: Fanservice and RPG parody. But this episode does away with the latter, but does ramp up the former to ludicrous (moreso than BW usually does) levels. Not only does it finally shows nipples, it generally goes as far as it could, without becoming outright hentai. As in, it shows pretty graphic girl-on-girl sex, just short of outright showing genitals.
And that's it, basically. There are no RPG tropes parodied and it's generally lacking in jokes, missing a crucial aspect of the series itself.
With the right expectations, this bonus episode can be rather enjoyable. Despite having the same length as a normal episode, it should be rather seen a a little bonus. But if you expect something more like the regular series, you're in for disappointment.