If anyone did any proper study, they might come to the conclusion that vampires were apex predators. Kaiba knew he was an apex predator, but he kept himself firmly under control at most times, despite it.

He didn't give into his prey drive, like some common animal. There was no reason. He was sentient and civilized, thanks.

But Yuugi's scent compels him. His little actions inflame him.

He didn't even realize he was half-hard yet, all he felt was Mokuba's hand squeezing his--yes. He has to get out of here. He can. It'll be fine

Until Yuugi falls out of his chair and hits the ground, like a tripped zebra on the savanna, legs useless, and looking extremely pathetic, if Kaiba's honest with himself.

His entire body tenses, and Mokuba considers letting him go out of fear...but he wants to try and bring Seto around, to stop him from doing something they'd all regret.

"Seto, please don't!" he calls out as he feels his brother prepare to wrench free. "Why are you doing this?"

Kaiba takes several steps forward, dragging his little brother along as he bares his fangs. His eyes flicker from blue to red as his instincts urge him on. He has to...or he might die. He's sure of it.