(figuratively, idiomatic) heart pounding; butterflies in one's stomach

ふし: a kind of fishing harpoon consisting of an iron trident head fitted to an oaken shaft / 五倍子, 付子: a gall on the Rhus javanica or Rhus chinensis tree, also known as the Chinese nutgall tree

selling on the spot

(slang) makaizou, modification of a humanoid (usually female) figurine, usually sexual in nature (removing clothes, etc) / (slang, by extension) drastic and wild modification