to sit astride / to ride (a horse, bike etc) / classifier for saddle horses
骑
=
奇
+
马
:
The Queen of Hearts (qi) is pursuing her favourite hobby just inside the space station's entrance (Ø2): she is riding (骑) a unicorn (马) drinking a cappuccino (奇).
The Queen of Hearts (qi) craves a cappuccino (奇) just inside the entrance of the space station (Ø2), and the robot (大) has one in his robot hands. He will give it to the Queen of Hearts under one weird (奇) condition: she shall prove that she's worth to receive the cappuccino by sitting on a bed of nails (可). The Queen agrees and pretends to be in much vain, but really she's just pretending since there is no gravity in the space station.