But Tom had finished first, and had to look on while Maggie ate her last morsel or two, feeling in himself a capacity for more.

Maggie didn't know Tom was looking at her; she was seesawing on the elder-bough, lost to almost everything but a vague sense of jam and idleness.
"Oh, you greedy thing!" said Tom, when she had swallowed the last morsel.

He was conscious of having acted very fairly, and thought she ought to have considered this, and made up to him for it.

He would have refused a bit of hers beforehand, but one is naturally at a different point of view before and after one's own share of puff is swallowed.
Maggie turned quite pale.

"Oh, Tom, why didn't you ask me ?" "I wasn't going to ask you for a bit, you greedy.