Loki gives a little moan as Phil's grip tightens in his hair, opening his mouth again involuntarily. It serves to allow his cock to slide in easily, another louder moan that Loki knows Phil will feel more than hear. He doesn't go completely limp, but his muscles do loosen, allowing Phil to guide his head further down his dick. It hits the back of Loki's throat, causing him to swallow reflexively. Then again completely on purpose.