Step-family Interrupts Giantess Fun

I'm just minding my own business masturbating to porn in my room when a knock on my bedroom door interrupts me. I open it to find a letter from Step-stepmom telling me to stop being antisocial and go join the Step-family pool party. Reluctantly, I get dressed and head outside but there's nobody around. Pissed off that I've been disturbed for nothing, I sit down to eat, then have a dip in the pool and a sunbathe. But there's something in my bikini top that's itching and tickling me and no matter what I do, I can't make it stop. In fact, it's rubbing right on my nipples and getting me all horny again, so I head back inside to finish what I started. As I begin to play with myself, I notice something touching my foot. It's my whole Step-family and they've been shrunk! First I'm concerned, but then I remember this is the second time they've ruined my fun. So I promise to help them after I'm finished. Ungratefully, they complain! So I decide if I'm going to help them, they can help me first.