Somehow, it's like kissing yourself.
That's what I always think when reading these body swap stories, where people do stuff to their own body, with someone else inside.
How narcissistic can these girls be? ;)
If the dark swap <==> swap girl came to life, she'd immediately come up with such a plausible explanation for why it's not like that that everyone would accept it. Yuzu certainly would. :)
Speaking of which, the Swap <==> Swap girls aren't doing it yet, but the other two girls are. As they go on, if they're kissing, aren't they swapping every few seconds? Must be like making love on a roller coaster.