I kinda read this scene with Allison slightly differently than her being forcibly coerced into performing fellatio. It almost looks to me like she's questioning why he lifted her head away from his cock after he shot a load into it. She actually looks more annoyed that he didn't let her finish swallowing as much of his cum as she could handle, like she had taken his cock to the hilt down her throat but was denied the opportunity to prove to him how much of his hyper-masculine seed she could ingest.
