"What the hell are you doing?" Levi meant for it to be a stern warning; it came out as more of an alarmed yelp.

In answer, Erwin did it again, his tongue circling lazily around the little pucker in Levi's flesh, even as it drew taut in a sudden, involuntary spasm of shocked propriety.

"Uhhhgh that is disgusting," Levi moaned, in tones that suggested otherwise. "How can you even--oh, Christ don't put it--" he broke off with a little choked sound, Erwin's fingers digging more firmly into Levi's splayed buttocks to hold them still against his open mouth. His tongue was first a warm, wet nudge, then a hot twist, then a greedy thrust, and Levi's defenses were breached.

Levi fell forward onto his hands, helpless to stop the invasion. Erwin fucked with his mouth just as well as with anything else, and with his coaxing hand around Levi's cock, Lance Corporal Levi was both outflanked and undone. He shuddered in his capitulation, and came all over his Commander's hands.

Erwin licked the shivering opening until Levi was utterly spent, clinging to his officer's knees, skin gleaming with sweat.

"That's what I'm doing," Erwin said, with matter-of-fact smugness. "Want me to do it again?"

Levi glared at him over his shoulder. "Only if you wash your fucking mouth first," he said, nudging Erwin in the shoulder with a well-aimed heel. "I don't want you getting my asshole all dirty."

Erwin's open palm landed on Levi's buttock in a firm slap, his grin was both appreciative and fond. "It wouldn't be the first time."