Shotaro: Shotaro-kun's Fantasy Play

Description

Left in the care of my older cousin, I seem to have gotten a little horny. I tried teasing my napping older sister with a vibrator... or poking her boobs. Then, I must've hit a sensitive spot, because my sister wet herself and I was shocked! Later, we experienced a strange feeling washing each other in the bath. Then, during a science project experiment, we got naked and were all slippery together when my dick and her pussy docked! ...Was this my first time having sex?