Evelyn wants to stop, wants to flee from this humiliating act that she so willingly started to perform, but she can't work up the courage to stop now. Surely that must be the problem, and not because she's actually deriving any enjoyment from this sick act. Of course, the stiffening of her nipples puts the lie to that. She continues to let him guide her motions, her eyes fixed on his cock as she pleasured him, feeling more of that hot stickiness between her breasts. She actually felt a strange bit of pride that he was enjoying it as much as he was, his encouragement keeping her going. He does get another gasp from her as his attentions return to her prominent pink nipples, another wave of weakness passing through her as he teased and pinched her.