With a grizzled sigh, the portly, elderly grandpa settles into his armchair, his substantial belly heaving with each breath. His chubby fingers, speckled with age, dip into his sweatpants, pulling out his semi-erect, veiny cock. He strokes it lazily, his fat belly jiggling with the motion. His breathing grows heavier, his face flushes, and he grunts, his hand moving faster, until with a final gasp, he cums hands-free, his belly glistening with his own spend.