[Supe (Nakani)] Nipple Beam! Zaaap!! [Decensored]

A mischievous older sister discovers she can weaponize her own breasts, blasting her stunned younger brother with a euphoric "Nipple Beam" that leaves him twitching and breathless in her lap. She soon takes full advantage of his helpless, oversensitized state with a slick, teasing handjob, milking him dry with breathless promises that she wants him to put a baby in her. The story crackles with playful sibling tension and escalating heat, capped off by a sweet afterword and pinup from creator Nakani.