妻の祖母は、まだまだ現役超美熟女～孫婿ちゃん、寂しい時にはいつでもいらっしゃい～

One night, while my wife was away accompanying my mother-in-law to the hospital, I finally got my daughter to bed...

"Now, so what should I do?"

I decided to jerk off to an online video to relieve my urges, and I completely pulled down my pants and underwear.
A moment later, I was startled by a presence suddenly appearing at the side of my field of vision.

"Grandmother-in-law?! Wh...why are you in my room?"

"Oh, I knocked several times. But there was no answer, so I thought you'd passed out in your seat, and came over...and you were doing this♪"

Apparently, because I was wearing earphones and concentrating on the porn in front of me, I didn't notice the knock or her subsequent entrance.