You keep going

You remain in Lily's embrace for a few more minutes. You never thought you would enjoy something like this, especially not with your own sister, but despite the struggle, you find it quite arousing.

"You're handling this pretty well. Didn't think you would last this long." She says, you can tell it's an honest compliment.

"It's not easy." You respond through a grimace "But i don't want it to stop either."

She smiles, you can tell for once she looks proud of you, proud of your endurance.