Grandpa Roland attacked Marceline as soon as he woke up. He bit her on her neck, consuming her sweet blood. Marceline didn't do anything. She just allowed her grandpa to drink her blood.
She could tell that he was hungry. He was weak because Victoria didn't feed him any blood. Marceline could feel the stinging sensation of his fangs, sucking her blood.
Grandpa Roland didn't stop. He couldn't get enough of her blood. But at the same time, his intense hunger was slowly dissipating. Her blood was enough to satiate his cravings.
Marceline felt her eyelids becoming heavy. She was about to lose consciousness. Grandpa Roland had already consumed a great amount of her blood. The poison of his vampire's bite was also draining her energy.
Grandpa Roland was so immersed in sucking her blood when suddenly someone entered the underground basement in a flash. Kira smelled Marceline's blood so he knew that something wrong was happening in the basement.