NAIAD-007 AI live-action photo of stepfather and sister that's too crazy

[The long-awaited live-action AI! The atmosphere is just the same!] This is a story from last year when I went back to my parents' house during summer vacation in college. My family consists of my mother, me, my sister, and my stepfather who remarried a few years ago. The thing that surprised me the most when I went back home after a long time was how much my sister has grown. She's grown taller, her breasts have gotten bigger, and she's grown into a woman more than I expected, so I was pretty surprised. She was so defenseless after taking a bath with just a bath towel on, so I was pretty embarrassed as a virgin with no experience yet lol. Her butt had a really nice shape... and... is this the main point? I was bored at my parents' house, so I borrowed an unused laptop from my stepfather's room to do my seminar assignment. Now that I think about it, he must have hidden it. That's how I found it by chance.