Lisa gets handsy.

“Wohoho Lisa,” Bart said in more that a little bit of panic at the sudden shift in the power dynamic of the situation. “What’s come over you?”

“Oh Bart. You said you wanted satisfaction,” Lisa said leaning in close to her brother. “Well I’m going to leave you satisfied.”

She emphasised the word satisfied by taking Barts hard cock in her hand. Mmm she sighed as she felt Bart twitch at her touch. Being only the second male penis she’d ever touched, Lisa couldn’t help but start to analyse the two phalluses. Barts was bigger by about two inches, being able to fill up Lisa’s hand and then some. Was it possible to feel hotter too Lisa wondered?

Lisa began to stroke her hand down the length of Barts shaft. She found it a thrill the way he gasped ahh, which became higher with the second stroke. By the third though it seemed just as high and nervous as Milhouse had been in the treehouse.

Lisa looked down to see Barts cock fire off a string of white semen that splattered on the belly of her dress. More followed as Bart shook uncontrollable, releasing his sperm all over his sister front. She could feel hot thick liquid pool within her wrist and run between her now sticky fingers.

“Oh Bart. What’s come over me? You just did! Haha,” Lisa teased at the second premature ejaculation she had caused.

Bart red with embarrassment, snatched up his shorts and fled the room, leaving his camera behind.