Sexy co-ed babysitter Melanie has taken her AB boy to the park. He soon wet his diaper and needed to be changed right away so she lay him on a change mat on the grass. When she was wiping his willy he got a massive stiffy and Melanie started to get aroused. The harder he got, the wetter her pussy got. Not caring who could be watching she hoisted up her short skirt and lowered herself onto his big thick stiffy and fucked him long and hard. She had the biggest orgasm before hopping off, powdering him and putting a fresh diaper on him like nothing happened.