Record her

As Natsumi picked over to Sato's clothes, she saw a phone fall out of her pocket.

'I've got a perfect idea.' Natsumi held all of Sato's discarded clothes in one of her arms while she held the phone with the other. Pointing it a Sato, she hit the record button.

Natsumi recorded Sato's pleasure, Sato was caught up her delusions of Mahiru while being completely unaware that she was being recorded.

"Mairhu~ Mahiru~ Ahh~ Ahh~" Sato massaged her body, caressing her breasts and stroking her pussy without a care in the world.

"Ahhhhh!" Sato came again, her face revealing how much she enjoyed what she just did. Natsumi stopped the recording and watched it over, even on Sato's shitty little phone, all of what Natsumi wanted to be seen was perfectly visible in the recording.

"Awww, how cute." Natsumi said as she replayed the video to Sato who had finally realised what she did.

"I wonder how Mahiru will react to your little masturbation video?" Natsumi said as she held the phone up high, about to send Mahiru the video of Sato.