>>12518055oh well you see the hole is facing towards Gura on the lower part of the pumpkin and jack o lantern itself has the whole top removed making a wide bowl. This can be used as a candy bowl that you would reach into to grab a piece of candy.
The implication is that Gura has put her futanari penis(es) into the hole that you cannot see so when you reach into the bowl to take a piece of candy you will accidentally grab her penis(es) instead, hence the mischievous facial expression.
