He pulls the plug on the router

He needed to get his sister alone to avoid further embarrassment. Whatever this was, the guy on the call didn’t need to see any more of it. Thinking quick on his feet, Mason moved quietly to where the router for the wifi was plugged into the wall in the hallway. His hands were shaking a little as he reached down and pulled the plug out in one smooth motion. The small green lights on the router blinked and went dark.

Just as he expected, the voice from the videocall suddenly cut out mid-laugh. The apartment fell into sudden silence, broken only by the soft sounds of Serena still moving on the carpet.

Mason waited outside the door for a few minutes. His heart was pounding so hard he could feel it in his throat. He hoped his sister would get the memo and put something on. He pictured her snapping out of it, grabbing one of his t-shirts or a towel and then acting all embarrassed when he finally walked in. Maybe she would even laugh it off later and tell him it was just some stupid game that went too far. He knocked lightly on the doorframe and announced himself, trying to keep his voice normal.

“Serena? Hey, it’s me. I’m home early.”

No response.

He waited another ten seconds, then knocked again, a little louder this time.

“Serena? You in there?”

Only to hear a loud moo in response.

“Moooooo!”

The sound came from inside the room, clear and animal-like. It sent a chill down Mason’s spine. That wasn’t his sister’s normal voice. It was deeper and emptier. Which caused him to open the door all the way.

Mason stepped inside and his eyes immediately found Serena. She was still completely naked, still on all fours in the middle of the room. Her long jet-black hair hung down around her face and brushed against the carpet. Her massive breasts dangled heavily beneath her, the dark nipples brushing lightly against the floor every time she shifted. Her ass was raised slightly, round and firm and he could still see the slick shine between her thighs where her pussy had been stretched by the bat. The baseball bat itself lay abandoned a few feet away, wet and glistening.

She turned her head to look at him. Her light brown eyes were still glassy and distant, no spark of recognition, no shame, no surprise at being caught like this. She met his eyes for a second, then opened her mouth and let out another loud moo.

“Moooooo!”

Mason stood there frozen, the door handle still in his hand. The smell of sex hung thick in the room, musky, wet, unmistakable. His sister’s naked body was right there in front of him, presented like an animal and she was looking at him like he was just another person in her field or something. No attempt to cover herself. No rush to stand up. Just that blank, obedient stare and the low sound of her mooing again softly as she lowered her head toward the carpet once more.

“Serena…” he whispered, his voice cracking a little. “What the hell is going on?”

She didn’t answer with words. Instead she crawled forward a couple of steps on all fours, her heavy tits swinging pendulously with the motion. Another soft moo escaped her lips as she looked up at him again, almost expectantly.

He didn’t know what to do. His hands felt clammy and his chest was tight. He took a slow step closer, careful not to scare her even though he wasn’t sure if she could even feel scared right now.

“Serena?” he said again, voice shaky. “Come on, it’s me. Mason. Stop this. Wake up.”

She just tilted her head slightly, still on all fours and let out another long moo in response.

“Moooooo…”

Mason reached out and gently grabbed her shoulder, giving her a light shake. Her body moved easily under his hand. Her massive breasts swung heavily with the motion, the heavy flesh slapping together softly. He tried to look away but his eyes kept dragging back to them. They hung full and pendulous, dark nipples stiff, jiggling every time he shook her again, a little harder this time.

“Serena, snap out of it. This isn’t funny. Please.”

He shook her once more, trying to get some reaction, some spark of his normal big sister. Instead her tits just kept shaking, heavy and hypnotic, swaying from side to side with each movement. The sight made his mouth go dry. He could see the way they bounced and settled, the smooth olive skin stretching tight over all that soft weight. His cock twitched in his pants before he could stop it. Shame flooded through him hot and fast. This was his sister. He shouldn’t be looking. He definitely shouldn’t be getting hard while she was like this.

But he couldn’t stop staring at the way her breasts moved.

He shook her again, a little rougher, watching those heavy tits swing and slap. For a second he forgot what he was even trying to do. His hand stayed on her shoulder longer than it should have. Her skin felt warm.

“Fuck… Serena, come on,” he muttered, finally pulling his hand back like he’d been burned. “This isn’t you. What’s happening?”

She lowered her upper body until her chin rested on the carpet, ass still raised high in the air. Her light brown eyes stayed fixed on him, completely empty and patient. Another soft moo slipped from her lips as she shifted her weight, making her hanging breasts sway again.

Mason swallowed hard. The router was still unplugged in the hallway. The call was dead. No one else was watching. It was just the two of them now. But his sister wasn’t back to normal. If anything, she seemed even deeper into whatever this was.

He needed answers. Standing here shaking her wasn’t working. Maybe the laptop had something on it. Maybe there were messages or a record of the call that could explain what the hell was happening.

Mason turned and walked quickly back into the hallway. He plugged the router back in. The little green lights blinked on one by one. He waited until the wifi symbol on his phone showed full bars, then went back into the bedroom.

Serena was still on all fours exactly where he had left her, chin against the carpet, ass up, heavy tits resting on the floor. She mooed softly again when she heard him come back in, but didn’t move otherwise.

He went straight to the laptop on the low table. The screen had gone to sleep, but when he tapped the trackpad it woke up. Skype was still open. It had started to try reconnecting to the network again. The video call window was closed now, but there was a contact at the top of the recent calls list: “Masters from the Alpha 7 frat house - Computer 3”.

Mason’s stomach dropped. What the fuck was this?

He clicked on the name. The chat log opened.