You accept their offer

Chris looked down at Gwen who began stroking his semi erection gently and biting her lip. Chris couldnt help himself "I want you to show me how grateful you are for me to change your disgusting diapers, I know youre excited so lets see some enthusiasm." Gwen looks shocked at Chris's response at first but then she smiles wryly and looks over at Taylor. Taylor nods in understanding and Gwen gets up and stands next to Taylor and guides the pair to their knees. The crinkling of padding as they go down is exciting in a weird way to Chris. Gwen puts on her most sultry impression "please big brother, can I suck your big dick? I've been waiting for a big strong man to come change me," she said in a babyish voice. Taylor nodded in excitement.

Chris walked over to the two, on their knees and diapered. The booster had thickened their padding so much that their legs were spread and he could see their padded crotch. Weirdly, Chris was fully erect in his pants now. He stepped forward, but Gwen initiated. She unzipped Chris's pants and pulled out his dick. It looked massive in her hand and the twins stared for a moment. Then Gwen whispered in Taylor's ear and she giggled. Taylor pushed her face forward and began sucking on Chris's balls. He moaned in surprise, and put his hand on their heads and pulled Gwen's face to his tip. She needed no guidance and quickly set to work on his shaft, bobbing up and down. She was able to bob in and out of her throat taking most of his dick everytime.

Chris was almost overwhelmed by the situation, but became entranced by the twin's padded pink and blue padded butts wriggling under him. He reached down and grabbed the seat of their diapers firmly, eliciting a strong moan from Taylor. The bobbing and sucking became too much for Chris and his dick began to throb. Taylor in confusion moved back and looked up at Chris as he started to cum. Gwen took her cue and did her best to fit as much of Chris down her throat as she could. Chris shuddered and came in Gwen's mouth, shooting a massive load. Gwen pulled up and looked up at Chris and showed off her trophy. Grinning she opened her mouth as cum spilled over. She rubbed his softening dick across her face smearing the cum even more. She looked at Taylor and Chris confidently. "I've always wanted to do that," she grinned with pride. Taylor leaned forward and started licking some of the leftover cum from Gwen's face. "Thanks big brother for changing us!" she said with seemingly genuine gratitude. "Lets get up to dinner before we get in trouble though," Taylor said as she baby wiped the mess from Gwen's face.