Caution: Playing with the Body Proportion Sliders Could Have Unforeseeable Cocksequences (x-post from r/doujinshi)
Ukemi = bottom: the verb ukeru means to "take, receive, accept," thus uke (receiving) mi (body, party) means "one who receives," or, "a bottom." Neko = bottom: neko literally means "cat". It has exactly the same meaning as ukemi, but in a slangier way.
Kaikan Change ♂⇔♀ ~Hajimete wa Onna no Karada de~ Part 1 (condom, glasses, masturbation, outdoor, body swap, blowjob, oral sex)
Ukemi = bottom: the verb ukeru means to "take, receive, accept," thus uke (receiving) mi (body, party) means "one who receives," or, "a bottom." Neko = bottom: neko literally means "cat". It has exactly the same meaning as ukemi, but in a slangier way.