DVRT-014 - Helping with the masturbation power generation, Misaki Sugisaki

I'm living with my brother's family, and the only way I can pay them back is by masturbating to generate power. Today, while I was at it, my sister-in-law came in and offered to help. She taught me some tricks for 'charging,' and we ended up having a combined power session. It felt so good that I couldn't hold back and finished inside her.