Oh hell. Mokuba's in over his head, he's not even remotely stopping his brother at this point. The only saving grace is that Seto's moving very slow, trying to fight his instincts and not succeeding. He keeps moving close to Yuugi, until he's close enough to kneel next to him and brush a cool, slender thumb across Yuugi's cheek.

Warm...he's so warm that Kaiba finds himself jealous. He misses being warm. He misses the feeling of circulating blood in his veins, the pulse and heartbeat of the living.

He covets that, the sensation he can never feel again. Stolen...

And now he would steal as well.

He moves forward, his lips parting wider, a hissing breath escaping him as he draws closer to Yuugi's neck.

They're both entranced.

Seto...he can't even hear Mokuba, or feel him pulling on his shoulders.

"SETO, PLEASE DON'T! SETO!! ISONO, HELP ME!!!"

He can see the veins on Yuugi's neck standing out, pulsing as they pumped blood so efficiently. It's amazing what Kaiba's eyes see, and he's sure he will never stop marveling at the sight. Not even when he seals his lips against the side of Yuugi's throat, and his fangs prick gently at the man's skin. Just enough to be felt.

But he hesitates. Nearly all of him is trembling with the want to pierce and taste the flood that would ensue.

Every part of him but his desire to live the life he'd made. The pride of how he had risen, made a life for his brother and himself.

The brother who's even trying to pull at his hair now, just to try and get him away from a too-pliant Yuugi.