Gb, lost in his fantasy, doesn't hear Jc approach. Caught with her panties, he freezes, but Jc, intrigued, sits beside him. "Let me help," she offers, wrapping her hand around his stiffening cock. They work in sync, Gb's breath hitching as Jc's touch sends sparks. As his balls tighten, he warns her, "I'm gonna cum." Jc smiles, guiding his release onto her bare skin, marking their newfound sibling bond.