It simply makes sense that Su-jin would go for the soft underbelly. Most predators go for that or the throat, except that there's little in the throat for Su-jin to eat. Go directly for the belly, where there's easy access to the organs. Start there in case he's interrupted. Eat the rest if there's time. Clean up his mess if there's time. Leave no evidence if there's time.

Vena inhales deeply when Su-jin's fingers curl against him. For just a moment, he envisions those fingers digging into him, tearing him open, digging out his organs one by one. He curls his own fingers around the hand on his stomach. "I could. Not only will I survive, but I'll heal as well. Given enough time, I'll heal from most anything, though the process is made faster by sex that would be provided by you."