That would make me so happy, Sanae... [she presses a kiss to her sister's lips, starting slightly more pure, knowing she doesn't have to take it into something too lustful yet]

Can you feel it, sweetie? I've become so shamefully hard just thinking about it... [All things considered, she was barely touched, just the idea was enough. The sounds Sanae made, the things she was saying, imagining taking that cock inside her, imagining sweet, innocent Sanae coming inside her pussy.]