緊張刺激【抓住妹妹在樓梯間偷偷自慰】趁機把她約出來吃飯，然後帶到酒店猛操騷逼

Nervousness and excitement [grabbing my sister and secretly masturbating in the stairwell] took the opportunity to ask her out for dinner, and then took her to the hotel to have sex.