If Yao Ling was in her clear mind, she would already find out from the start that Yao Ying was only pretending to be dreaming. But all of her thought was already focused on her breasts, Yao Ying's mouth, and Yao Ying's hand. She loved the way he touched her, making her feel more aroused. When did she have the time to think and make such a conclusion?
Yao Ying loves her responsive body. Despite his lust, he was still able to think clearly --- mainly because he felt the painful hardness down there. He knew that he wouldn't get any fulfillment just like the last time they were being intimate. Well... he should just suck it up! Although he was giving Yao Ling pleasure, he was actually enjoying himself too, so he wasn't going to complain.