Mako may have been all over Ryuuko, but Ryuuko herself sees Mako as a "pretty nice friend, no more than that". This is, everybody knows that who Ryuuko really loves is her demonic alien sailor suit. They even having another of their lover's quarrel this episode.
Mako's mother seems pretty happy to be in the nudist base tough.
Satsuki has already proven her stubborness ever since she's spent some 17 episodes wearing a demonic alien sailor suit that absolutely hates her and wants to take over her mind and body, "not wearing it, just forcing your arms trough its sleeves", as her psycho abusive mother puts it.