I was just supposed to look at my stepsister

My task was simple and unique, to stay at home and watch my stepsister so that she didn't do anything stupid, but being there with her, alone and her being so daring naughty like that in showing off to me only in lingerie, made it all end on the couch, with her putting me to suck her small tits while she gave me a handjob with her soft and delicate hands.