Is the last panel supposed to say "She's like a puppy, but they're supposed to be twins." ?
Seaport's name in Japanese is "kouwansei-hime", so fans switched the first two characters to get "wanko" because it sounds cute and, yes, means puppy.
It's been a while, Midway.That too... but I came for the flower viewing.This is Hoppo-chan....She's cute.It's Hoppo-chan from Seaport-nee's place...!What's up? Did you come for the operation?This is Midway-oneechan!You finally remembered me..That's a good girl.Oh? It's been a while, Seaport...Nothing to it...!Ah...She's a Seaport...but the younger twin...*Whump*This is...Seaport-oneechan!?