Not only that, Dracula was also taller than Feng Mei.
Anyways, Feng lost in his excitement was ready to directly activate his Magi-Mech without any consideration to Dracula's naked body.
The power-up and shut-down operator was on the backside of Dracula head, hidden beneath his soft and fluffy black-hairs. The operator only identifies Feng's fingerprint, hence only Feng Mei can activate and deactivate Dracula's system.
The excited Feng pulled the slumbering Magi-Mech near him so that he could re-activate Dracula, who has been successfully upgraded into a transcendental grade Magi-Mech.
Feng gently pressed his right-hand forefinger on the operator. The operator scanned his fingerprints and voila, the slumbering robot began to power-up.
The system(Dracula's mechanical-brain) absorbed some electricity from one of the six energy-tubes contained in the metallic blue-box to start the complex programs.