[Ringo no Naru Ki (Kise Itsuki)] Onii-chan, Illya to Shiyo? (Fate/kaleid liner Prisma Illya) {Hennojin}

Illya finally makes her move on Shirou, slipping one of Ruby's potent medicines into his mouth before confessing the love she's hidden behind being his little sister — and sealing it by taking him deep down her throat, teasing that they have a whole day to enjoy. What follows is a drug-fueled marathon where the petite girl rides her onii-chan, sobbing and ahegao-ing through climax after climax until she's milking every last drop from him. A sweetly twisted sibling tryst where devotion tastes bitter and one potent dose turns a shy confession into a day neither of them will forget.